A.SELECT Id, Name, Account__r.Name FROM Contact WHERE Account__r.Industry

B.SELECT Name, (SELECT LastName FROM Contacts) FROM Account

C.'Media'
SELECT Name, (SELECT LastName FROM Contacts__r) FROM Account

D.SELECT Id, Name, Account.Name FROM Contact WHERE Account.Industry = 'Media'

A.Get request

B.Postback request

C.If PageReference points to the same controller and subset of extensions, postback request, otherwise get request

A.Optimize SOQL query performance.

B.Avoid nested Apex iterations.

C.Reduce view state in Visualforce pages.

D.Use Map collections to cache sObjects.

A.Import updateAccounts from @salesforceapexAccountControllerupdateAccounts';

B.Import updateAccounts from AccountControllerupdateAccount';

C.Import updateAccounts from AccountController';

D.Import updateAccounts from @salesforceapex AccountController';

A.Annotate the entire class as @AuraEnabled instead of just the single method.

B.Remove line 06 from the Apex Controller and use firstName In the return.

C.Change the argument from JSONObject to String.

D.Change the method signature to be global static, not public static.