Explanation:

- Diwan-i-arz: This department was responsible for military affairs. It oversaw the recruitment, organization, and management of the army.

- Diwan-i-khairat: This department focused on charitable donations, welfare, and public works. It handled aid and religious endowments.

- Diwan-i-risalt: This department dealt with foreign affairs. It managed diplomatic correspondence and relations with other states.

- Diwan-i-insha: This was the department of state correspondence. It dealt with official correspondence, record keeping, and the drafting of royal decrees.