Explanation:

- Option 1: Alauddin Khilji

- Zafar Khan was indeed a famous general under Alauddin Khilji.

- He played a key role in defending the Delhi Sultanate against the Mongols.

- Option 2: Iltutmish

- Iltutmish was the third ruler of the Mamluk dynasty.

- He reorganized the administration and expanded the Sultanate.

- Zafar Khan was not associated with Iltutmish.

- Option 3: Muhammad bin Tughluq

- Muhammad bin Tughluq was known for his ambitious projects.

- He had several military campaigns but Zafar Khan wasn't his general.

- Option 4: Balban

- Balban was a strong Sultan of the Mamluk dynasty.

- He is remembered for his policy of consolidating power.

- Zafar Khan was not connected with Balban.