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This solution meets the requirements of creating a multicloud, three-tier application using Calm. It ensures that each tier of the application has a redundant copy running on both Nutanix andAWS, and that the application can tolerate either a cloud provider outage or a local Nutanix cluster outage. The other options do not provide full redundancy for each tier, or require manual intervention to create the AWS instances. References: Nutanix Certified Professional - Multicloud Automation (NCP-MCA) Exam Blueprint Guide, page 10; Nutanix Multicloud Automation Administration (NMCAA) Course, Module 5: Blueprints.

To effectively automate the scaling of the environment, the administrator needs to know the steady state resource utilization and the expected resource utilization under load of the application, database, and web VMs. These two pieces of information will help the administrator to define the scaling policies, thresholds, and actions for the blueprint service that deploys the infrastructure. The administrator can use the Self-Service feature of Nutanix Multicloud Automation to create a blueprint service that can scale up or down based on the resource utilization metrics. The administrator can also use the Runbook feature to automate the scaling actions using scripts or APIs.

The other options are incorrect because:

• SLA uptime of the application: This is not a piece of information that is needed to automate the scaling of the environment. The SLA uptime of the application is a performance indicator that measures the availability and reliability of the application. The administrator can use the X-Play feature of Nutanix Multicloud Automation to create event-driven playbooks that can trigger actions based on alerts or schedules to ensure the SLA uptime of the application.
• If the application needs to be highly available: This is not a piece of information that is needed to automate the scaling of the environment. The high availability of the application is a design consideration that affects the architecture and configuration of the infrastructure and the application. The administrator can use the Projects feature of Nutanix Multicloud Automation to create projects that can define the availability domains, networks, and storage for the infrastructure and the application.

References:

• Nutanix Certified Professional - Multicloud Automation (NCP-MCA) Exam Blueprint Guide, Section 2.1, 2.2, 2.4, 2.5
• Nutanix Multicloud Automation Administration (NMCAA) Course, Module 2: Self-Service, Module 3: Runbook, Module 5: Projects
• Training Spotlight: Nutanix Multicloud Automation Administration (NMCAA), Video 2: Self-Service, Video 3: Runbook, Video 5: Projects

An event trigger is a type of trigger that can be used to execute a playbook when a specific event occurs in the Nutanix platform. An event trigger can be configured with various parameters, such as the event type, the target VM, the target VM category, the target project, and the target user. In this scenario, the administrator wants to be notified when a subset of VMs within the Environment:Dev category is restored from snapshot. Therefore, the event trigger should have the following parameters:

• Event type: Snapshot Restoration. This is the event that indicates a VM has been restored from a snapshot.
• Target VM: VMS in Environment: Dev. This is the filter that specifies which VMs are relevant for the trigger. By selecting VMS in Environment: Dev, the trigger will only apply to the VMs that belong to the Environment:Dev category.
• Other parameters: These can be left as default or customized as needed.

References:

• Nutanix Multicloud Automation Administration (NMCAA) Course, Module 3: X-Play, Lesson 3.2: Creating and Managing Playbooks, Slide 13: Event Trigger
• Nutanix Certified Professional - Multicloud Automation (NCP-MCA) Exam Blueprint Guide, Section 3: Validate Blueprints, Playbooks, and Automation Settings, Objective 3.1: Determine the causes of a Playbook execution failure

A service dependency is a feature of Nutanix Calm that allows you to define the order of execution and the conditions for starting and stopping services in a blueprint. By creating a service dependency between the application and the database, you can ensure that the application will not start until the database is fully installed and ready. This avoids the need for manual intervention or inefficient workarounds like loops or sleep statements. References: Nutanix Multicloud Automation Administration (NMCAA), page 41; Nutanix Certified Professional - Multicloud Automation (NCP-MCA), section 2.