Explanation:

- Option 1: Halley's Comet

- A well-known comet that can be seen from Earth every 75-76 years. It was not the target of Deep Impact, but rather the Giotto spacecraft in 1986.

- Option 2: Hale-Bopp

- This comet became famous in 1997 for being exceptionally bright and visible over a long period. It was not the subject of Deep Impact’s mission.

- Option 3: Hyakutake

- A comet that passed close to Earth in 1996, known for its brightness and long tail. Deep Impact did not target it.

- Option 4: Tempel 1

- Deep Impact’s primary mission was to study Comet Tempel 1. It successfully deployed an impactor to collide with the comet, allowing scientists to study the material beneath the comet's surface.