Q.

Which of these statements is truly acceptable?

A. a precondition is an assertion guaranteed to be true when the operation finishes
B. a post-condition is an assertion guaranteed to be true when the activity or operation begins
C. an event which causes a use case to begin is called a signal
D. activity diagram shows concurrency by use of fork & join.
Answer» D. activity diagram shows concurrency by use of fork & join.
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