Joe is the commissioner of a professional sport league in the United States. Tom is a quarterback of the league, who is accused of executing a cheating strategy in an attempt to win more games. Joe wants to investigate the matter and gather evidence against Tom. Which of the following actions should Joe take?
1) Conduct interviews with other players and coaches
2) Review game footage to look for suspicious behavior
3) Hire a private investigator to gather evidence
4) Suspend Tom from the league until the investigation is complete