What is the correct syntax for calling a controller action from a Visualforce page and updating part of the page once the action is completed? (Choose two.)

A developer wants to retrieve and deploy metadata, perform simple CSV export of query results, and debug Apex REST calls by viewing JSON responses.
Which tool should the developer use?

A company has a custom object, Sales Demo Request, that has a lookup to an Opportunity. It is required that a Sales Demo Request record be created when an Opportunity's Probability is greater than 50%.
What is the optimal way to automate this?

A developer is building a Visualforce page that interacts with external services. Which interface should the developer implement to test this functionality? Choose 2 answers

A developer has been asked to create code that will meet the following requirements:
Receives input of: Map<ld, 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?