A. Testing and debugging are identical processes
B. Testing guarantees error-free programs
C. Debugging must be completed before testing
D. Testing reveals defects, while debugging locates and removes them

Solution

D. Testing reveals defects, while debugging locates and removes them

Explanation

Testing discovers that a problem exists; debugging identifies its cause and fixes it.

Testing error की मौजूदगी बताती है, जबकि Debugging उसका कारण ढूँढकर उसे ठीक करती है।