Which option is true about use of mocks in a Spring Boot web slice test? (Choose the best answer.)
A. Mocking a Spring Bean requires annotating it with @MockBean annotation.
B. If a Spring Bean already exists in the web slice test spring context, it cannot be mocked.
C. Mocks cannot be used in a Spring Boot web slice test.
D. Mocking a Spring Bean requires annotating it with @Mock annotation.
