The Azlan Shah Cup is a prestigious international field hockey tournament that has been held annually since 1983. It takes place in Ipoh, Malaysia and is named after the Sultan of Perak, Azlan Shah. Therefore, option 4 - Hockey is the correct answer.

Option 1 - Badminton: Badminton is a different sport that involves hitting a shuttlecock over a net with rackets. The Azlan Shah Cup is not associated with badminton.

Option 2 - Cricket: Cricket is a bat-and-ball game played between two teams. The Azlan Shah Cup is not associated with cricket.

Option 3 - Football: Football, also known as soccer, is a popular sport played with a round ball. The Azlan Shah Cup is not associated with football.

In conclusion, the Azlan Shah Cup is an important tournament in the sport of field hockey, specifically, and not in badminton, cricket, or football.