Military administration is related to Sadr-usSadr.

Explanation:
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Sadr-usSadr, also known as the Grand Sadr, was a high-ranking official in the Mughal Empire. The term "Sadr-usSadr" literally means "Master of Masters" and refers to the head of the religious establishment in the empire.

Key Points:
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1. Role of Sadr-usSadr: The Sadr-usSadr was responsible for overseeing various aspects of administration, including military matters.
2. Military administration: The military administration involved managing the armed forces, organizing troops, and ensuring their proper functioning. It encompassed tasks such as recruitment, training, provisioning, and deployment of soldiers.
3. Sadr-usSadr's authority: As the head of the religious establishment, the Sadr-usSadr held considerable influence and power. His role extended beyond religious matters and included involvement in political, administrative, and military affairs.
4. Coordination with other officials: The Sadr-usSadr worked in conjunction with other high-ranking officials, such as the Mir Baqi (head of the army) and the Diwan-i-Arz (military department), to ensure the smooth functioning of the military administration.
5. Importance of military administration: The Mughal Empire was a vast empire with a large and complex military apparatus. Effective military administration was crucial for maintaining the empire's territorial integrity, defending against external threats, and ensuring internal stability.
6. Other responsibilities of Sadr-usSadr: Apart from military administration, the Sadr-usSadr also had responsibilities related to ecclesiastical matters, land revenue administration, and judicial administration. However, in the given options, military administration is the most directly related to the role of Sadr-usSadr.

In conclusion, military administration is the aspect most closely associated with Sadr-usSadr in the context of the Mughal Empire. While the Sadr-usSadr had responsibilities in various spheres, his authority and role in military administration were significant.