______ was a key position in the royal court of Delhi sultanate and his role was of a general supervisor over all departments.

Diwan-i-Wizarat

The correct answer is Option 4- Diwan-i-Wizarat

Diwan-i-Wizarat was a key position in the royal court of Delhi sultanate and his role was of a general supervisor over all departments.

The other options are:

• Diwan-i-Mustakharaj: This department was responsible for the collection of revenue.
• Diwan-i-Amir Kohi: This department was responsible for the construction and maintenance of public works.
• Diwan-i -Waqoof: This department was responsible for the management of religious endowments.