How should a developer write the test to provide test coverage?

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A developer wrote Apex code that calls out to an external system.

How should a developer write the test to provide test coverage?
A . Write a class that extends HTTPCalloutMock.
B . Write a class that implements the HTTPCalloutMock interface.
C . Write a class that implements the WebserviceMock interface.
D . Write a class that extends WebserviceMock

Answer: B