Five tasks need to be completed: Task 1, Task 2, Task 3, Task 4, and Task 5. Task 2 must be completed before Task 3, and Task 4 must be completed before Task 5. Task 1 can be done at any time. What is a valid order of completion?
Answer: B. 2, 3, 1, 4, 5
Task 2 must precede Task 3, and Task 4 must precede Task 5, making 2, 3, 1, 4, 5 a valid order.