A Platform Developer needs to implement a declarative solution that will display the most recent Closed Won date for all Opportunity records associated with an Account.
Which field is required to achieve this declaratively?

A developer created a Visualforce page and custom controller to display the account type field as shown below.
Custom controller code:

Visualforce page snippet:
The Account Type is {!actType}
The value of the account type field is not being displayed correctly on the page. Assuming the custom controller is properly referenced on the Visualforce page, what should the developer do to correct the problem?

A developer considers the following snippet of code:

Based on this code, what is the value of x?

A developer wants to display all of the picklist entries for the Opportunity StageName field and all of the available record types for the Opportunity object on a Visualforce page. Which two actions should the developer perform to get the available picklist values and record types in the controller? Choose 2 answers.

What is considered the primary purpose for creating Apex tests?