The correct answer is (a) Iltutmish.
Sajda and Paibos are two forms of submission or obeisance that were practiced in the Delhi Sultanate. Sajda is a gesture of complete submission, in which the subject prostrates themselves before the ruler. Paibos is a less formal gesture, in which the subject touches the ground with their forehead in front of the ruler.
Iltutmish was the first Sultan of Delhi to require his subjects to perform sajda and paibos. He did this in order to assert his authority and to show that he was the supreme ruler of the Delhi Sultanate.
Firoz Shah Tughlaq, Razia Sultan, and Balban were all later Sultans of Delhi, and they all continued the practice of sajda and paibos. However, it was Iltutmish who first started this tradition.
Sajda and paibos were controversial practices, and they were not always accepted by the Muslim population of the Delhi Sultanate. Some people believed that these practices were un-Islamic, and they argued that the Sultan should not be treated as a god.
Despite the controversy, sajda and paibos remained a part of the Delhi Sultanate for many years. They were finally abolished by Akbar, the Mughal emperor, in the 16th century.