What are three benefits of using static resources in Visualforce and Lightning Components? Choose 3 answers

Exhibit:

What should be added to the setup, in the location indicated, for the unit test above to create the controller extension for the test?
A)

B)

C)

D)

A developer wants to create a Visualforce page that allows a user to search for a given account by Name.
If the account is found, the account details should be populated on screen. If no account is found, an error message should be displayed to the user.
How can this be accomplished? (Choose two.)

A company has a Lightning Page with many Lightning Components, some that cache reference dat a. It is reported that the page does not always show the most current reference data. What can a developer use to analyze and diagnose the problem in the Lightning Page?

Trigger on Contact ensures that whenever a Contact's custom field "User Level" is given the value "President," the related Community User's Role is updated as Manager. The Apex unit test method for testing this functionality is failing for a mixed DML error. What is one way that this problem can be solved?