The Thanjavur Palace (Maratha Palace) is known for its:

Art gallery and library
Imposing gateways
Ornate Durbar Hall
All of the above

The correct answer is: d) All of the above.

The Thanjavur Palace (Maratha Palace) is a palace complex in Thanjavur, Tamil Nadu, India. It was built by the Maratha ruler Serfoji II in the 18th century. The palace is known for its art gallery and library, imposing gateways, and ornate Durbar Hall.

The art gallery houses a collection of paintings, sculptures, and other works of art from the Maratha period. The library contains a collection of manuscripts, books, and other documents from the Maratha period. The imposing gateways are decorated with sculptures and carvings. The ornate Durbar Hall is a large hall that was used for royal ceremonies and other events.

The Thanjavur Palace is a UNESCO World Heritage Site. It is one of the most popular tourist attractions in Thanjavur.