Which of the following are 'Debugging' activities?

Which of the following are ‘Debugging’ activities?

Debugging and Testing are key activities in the software development lifecycle.

Which of the following are ‘Debugging’ activities?

A Identifying a failure

B Locating the cause of failure

C Fixing the defect

D Checking the fix has resolved the failure
A . a & d
B . a & b
C . b & c
D . c & d