Which code segment should you use?

You are developing an application that uses multiple asynchronous tasks to optimize performance.
The application will be deployed in a distributed environment.
You need to retrieve the result of an asynchronous task that retrieves data from a web service.
The data will later be parsed by a separate task.
Which code segment should you use?

A.
Option A

B.
Option B

C.
Option C

D.
Option D