Q. Which of these statements is truly acceptable? (Solved)
1. a precondition is an assertion guaranteed to be true when the operation finishes
2. a post-condition is an assertion guaranteed to be true when the activity or operation begins
3. an event which causes a use case to begin is called a signal
4. activity diagram shows concurrency by use of fork & join.
- d. activity diagram shows concurrency by use of fork & join.