During the Mughal period, the 'Naubat Khana' in a palace or fort complex was the:

The "Naubat Khana" (also called the "Naqqar Khana") was the drum house, where musicians played drums, trumpets and other instruments at fixed times of the day and on special occasions.

About the Naubat Khana:

• "Naubat" refers to the music played at fixed intervals, and "khana" means a room or house.
• It was usually built over or near the main gateway of a palace, fort or city.
• Musicians played the "naubat" (ceremonial music) several times a day, to mark the hours and to announce the presence of the emperor.
• Music was also played to announce the arrival of the emperor, important visitors and royal processions, and to celebrate victories, births and festivals.
• The instruments included the naqqara (kettle-drums), the shehnai and trumpets.

Importance:

• It was a symbol of royal authority; only the emperor and specially honoured nobles had the right to keep a naubat.
• Visitors had to dismount from their horses or elephants before passing the Naubat Khana, except for princes of royal blood.

Famous examples:

• Red Fort, Delhi: the Naubat Khana (Naqqar Khana) stands at the entrance to the courtyard of the Diwan-i-Aam; it now houses a museum.
• Fatehpur Sikri: the Naubat Khana stands near the entrance to the royal complex.
• Agra Fort also had a Naubat Khana.

Other parts of a Mughal palace complex:

• "Diwan-i-Aam": the hall of public audience.
• "Diwan-i-Khas": the hall of private audience.
• "Toshakhana": the treasury or storehouse of valuable items.
• "Ghusal Khana": the royal bath, also used for private meetings.
• "Jharokha": a balcony from which the emperor appeared before the people every morning ("jharokha darshan").
• "Zenana" or "Mahal": the women's quarters.

Why not the other options?

• ✗The treasury, royal kitchen and armoury had other names.