The correct answer is option 3, Muhammad Iqbal.

Muhammad Iqbal, a renowned Urdu poet, was invited to the Second and Third Round Table Conferences. The Round Table Conferences were a series of meetings held in the 1930s to discuss constitutional reforms in India. The conferences aimed to gather representatives from various political parties and communities to find a solution for the future constitutional setup of India.

Although options 1, 2, and 4 are also well-known Urdu poets, they were not specifically invited to the Round Table Conferences. It is essential to comprehend the context of the question and understand the historical events surrounding the Round Table Conferences to choose the correct answer.

In this case, Muhammad Iqbal`s invitation to the conferences highlights his prominent role in the political and intellectual spheres during that time. Students should note that being aware of the contributions and involvements of famous figures in history is crucial for accurately answering such questions.