Significant variation in process performance is a consequence of several causes that can be classified using which of the terminologies shown.(Note: There are 2 correct answers).

Significant variation in process performance is a consequence of several causes that can be classified using which of the terminologies shown.(Note: There are 2 correct answers).
A . Common
B . Random
C . Uneducated
D . Special
E . Vital

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Answer: A,D