Stump the chump - correctable erros and IW ?s

[MJT]

1. What do you do to correct the following errors: (a) a fifth down has been run (when can you and when can you not correct this error.) (b) team A has not been given its allotted 4th down (when can you and when can you not correct this error.)

2. List all cases when you MUST replay a down if there was an IW.

3. List all cases when the team in possession of the ball at the time if the IW has the option of replaying the down or not.