I just did the following question

What is the purpose of quality audit?
Select one:
A. Part of an ISO 9000 investigation.
B. To check if the customer is following its quality process.
C. To identify lessons learned that could improve performance on project.
D. To check accuracy of costs submitted by the team.

Answer is C

Explanation :
Quality audit involves identifying areas, which would help improve the performance in future.

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Do you think Explanation is correct?