Who among the following was the head of the Diwan-i-Insha department under the…

Concept: The Delhi Sultanate's central administration was organised into several Diwans (departments), each headed by a distinct official responsible for one function — finance, military affairs, intelligence/news, correspondence, or justice.

Application: The Diwan-i-Insha handled the Sultanate's official correspondence — drafting and issuing royal farmans (orders) and letters on the Sultan's behalf. This department was headed by an official titled Dabir-i-Khas, the chief scribe/secretary, who supervised the drafting and dispatch of all royal correspondence.

Cross-check: The other officials named belonged to different Diwans entirely. Barid-i-Mumalik headed the Diwan-i-Barid (intelligence and news-reporting). Amir-i-Dad assisted in judicial administration, enforcing the Sultan's orders in disputes. Wakil-i-Dar supervised the royal household and the Sultan's personal establishment. None of these three drafted or issued official correspondence, confirming the correspondence department's head by elimination as well as by definition.