In a training simulation, participating managers need to complete a number of tasks (W, X, Y, Z). We know...

In a training simulation, participating managers need to complete a number of tasks (W, X, Y, Z). We know the following:
- Z was completed before X.
- Y was completed before X.
- V was completed before X and Y.
- W was completed before Y but after Z.
Based on the above information, which of the following is NOT necessarily true?
O X was completed last.
O Z was completed first.
O W was completed before X.
O W was completed after Z.
O W was completed after V.