Step 1: Understanding the Concept:
This question asks to identify a founder of the All India Muslim League.
Step 2: Detailed Explanation:
\[\begin{array}{rl} \bullet & \text{The All India Muslim League was founded at Dacca (now Dhaka, Bangladesh) on 30th December 1906. } \\ \bullet & \text{The proposal for its formation was put forward by Nawab Salimullah Khan, the Nawab of Dacca. He was one of the principal founders of the organization, along with other prominent Muslim leaders like Aga Khan III (who served as its first president) and Mohsin-ul-Mulk. } \\ \bullet & \text{Mohammad Ali Jinnah joined the Muslim League later, in 1913, and eventually became its most prominent leader, but he was not a founder. } \\ \end{array}\]
Step 3: Final Answer:
Nawab Salimullah Khan was a key founder of the All India Muslim League.