Which of the following is NOT a valid use of decision coverage?

Decision coverage is a testing metric used to ensure that all possible paths (decisions) in the code have been executed at least once. It is not used to verify the correctness of module calls, which ismore related to integration testing or control flow testing. Options A, B, and D describe valid uses of decision coverage, ensuring that decisions are exercised in programs, business processes, and measuring the extent of coverage by a test suite​​ .