Among the given options, the person who was not a noble under Alauddin Khilji was Munim Khan (option 4). Option 1, Ain-ul-Mulk Multani, option 2, Zafar Khan, and option 3, Nusrat Khan, were all nobles under Alauddin Khilji.

Alauddin Khilji was the second ruler of the Khilji dynasty of the Delhi Sultanate. During his rule, he implemented various administrative and military reforms which strengthened his empire. He relied heavily on the nobles or the amirs who assisted him in governing the kingdom and maintaining law and order.

Ain-ul-Mulk Multani, option 1, was one of the prominent nobles under Alauddin Khilji. He held important military and administrative positions within the kingdom.

Zafar Khan, option 2, was another noble under Alauddin Khilji. He served as the governor of Gujarat and played a significant role in expanding the empire in the western regions.

Nusrat Khan, option 3, was also a noble under Alauddin Khilji. He served as the governor of Multan and played a crucial role in maintaining control over Punjab