Read the following excerpt and answer the questions that follow:

"The Lal Qila is a regular rectangle with the north wall following the old course of the Yamuna river. There are two gate-ways — the Delhi and Lahore Gates, and massive round bastions at regular intervals along the wall."

(Source: https://egyankosh.ac.in/bitstream/123456789/20281/1/Unit-33.pdf)

(a) Name any two structures found within the Red Fort complex and identify their significance.

(b) Which Mughal emperor built the Moti Masjid in the Red Fort, and what material was it made of?

(a) Two structures found within the Red Fort complex and their significance:

1. Diwan-i-Aam (Hall of Public Audience): This is where the emperor would meet and address the public and hear their grievances. It is a symbol of the emperor’s connection with his people.
2. Diwan-i-Khas (Hall of Private Audience): This hall was used for more private meetings and where the emperor held discussions with his courtiers or nobles. It is also famous for its ornate architecture and the peacock throne that once resided there.

(b) Moti Masjid was built by Aurangzeb using pure marble.