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The Salesforce Lightning Design System (SLDS) is a CSS framework that provides a look and feel that is consistent with Lightning Experience1. By incorporating the SLDS CSS stylesheet into the JavaScript applications, the developer can apply the same styles and components that are used in Lightning Experience, without having to rewrite the entire application or change the underlying logic. This is the quickest and most effective way to update the custom applications to match the Lightning Experience UI.

The other options are not as quick or effective as option A. Option B would require rewriting all the Visualforce pages as Lightning components, which would be time-consuming and complex, especially if the applications use a third-party JavaScript framework that is not compatible with Lightning Web Components. Option C is not valid, as there is no such attribute as enableLightning in the Visualforce page definition. Option D would enable the Visualforce pages to be accessed from Lightning Experience, Lightning Communities, and the mobile app, but it would not change the appearance or behavior of the pages to match the Lightning Experience UI. References:

• Style with Lightning Design System - Salesforce Developers
• Using the Salesforce Lightning Design System in Apps - Salesforce Developers

The developer can use the Laptop interface within the SilverLaptop class by using the keyword ‘implements’. This keyword indicates that the SilverLaptop class is implementing the Laptop interface, which means that it must provide a body for all the methods declared in the interface. For example, the SilverLaptop class can implement the Laptop interface as follows:

public class SilverLaptop implements Laptop { // code implementation public void turnOn() { // code to turn on the laptop } public void turnOff() { // code to turn off the laptop } }

The other options are not valid ways to use the Laptop interface within the SilverLaptop class. Option A uses the annotation ‘@Extends’, which is not a valid syntax in Apex. Option B uses the keyword ‘extends’, which is used to indicate inheritance between classes, not interfaces. Option C uses the annotation ‘@Interface’, which is also not a valid syntax in Apex.

References: Interfaces | Apex Developer Guide | Salesforce Developers, Prepare for Your Salesforce Platform Developer I Credential

To support split shipments, a developer should add an Order_shipment_Group_c object and a master-detail field on Order_Line_c. The Order_shipment_Group_c object represents a group of order lines that share the same delivery method and destination address1. The master-detail field on Order_Line_c establishes a relationship between each order line and its corresponding order shipment group. This way, the shipping information can be stored in the Order_shipment_Group_c object instead of the Order_c object, and any number of order lines on a single order can be shipped to different locations.

References:

• OrderDeliveryGroup | Object Reference for the Salesforce Platform | Salesforce Developers

• Rollup summary fields can cause the parent record to go through Save. This is true because when a child record is created, updated, or deleted, the parent record is also updated to reflect the changes in the rollup summary field. This update can cause the trigger on the parent object to fire again, which can affect the performance and logic of the trigger1.
• The trigger may fire multiple times during a transaction. This is true because triggers can be invoked by other triggers, workflow rules, or processes in the same transaction. This can result in multiple trigger executions for the same record, which can also affect the performance and logic of the trigger2.
• Duplicate rules are executed once all DML operations commit to the database. This is false because duplicate rules are executed before the DML operations are committed to the database. Duplicate rules are part of the validation rules that are run before the triggers3.
• The validation rules will cause the trigger to fire again. This is false because validation rules are run before the triggers, and they do not cause the triggers to fire again. Validation rules only prevent the record from being saved if the validation fails4.

References:

• 1: Roll-Up Summary Fields
• 2: Triggers and Order of Execution
• 3: Duplicate Management
• 4: Validation Rules