An ARENA (simulation software) question:

Which of the following statements about the future events list:

1. The order of events in the FEL can never change.
2. Events can be deleted from the FEL, but not inserted.
3. Most of the programming effort when using a commercial simulation package is spent directly managing the FEL.
4. Arena -- and in fact every commercial discrete-event simulation package -- maintains a FEL.
5. All of the above.