If the "PageReference.setRedirect" Apex function is set to False, what type of request is made?

A company decides that every time an Opportunity is created, they want to create a follow up Task and assign it to the Opportunity Owner.
What should a developer use to implement the requirements?

global with sharing class MyRemoter {
public String accountName { get; set; }
public static Account account { get; set; }
public AccountRemoter() {}
@RemoteAction
global static Account getAccount(String accountName) {
account = [SELECT Id, Name, NumberOfEmployees
FROM Account WHERE Name = :accountName];
return account;
}
}
Consider the Apex class above that defines a RemoteAction used on a Visualforce search page.
Which code snippet will assert that the remote action returned the correct Account?
Account a = controller.getAccount('TestAccount');

As part of a custom development, a developer creates a Lightning Component to show how a particular opportunity progresses over time. The component must display the date stamp when any of the following fields change:
* Amount Probability, Stage, or Close Date
What is the most efficient way to Query such information?

A developer has been asked to create code that will meet the following requirements:
Receives input of: Map<Id, Project_c), List<Account>
Performs a potentially long-running callout to an outside web service
Provides a way to confirm that the process executed successfully
Which asynchronous feature should be used?