Concept:
The command structure of the Indian Armed Forces (Army, Navy, and Air Force) is rooted in the principle of civilian control over the military. This authority is explicitly vested in the highest constitutional office of the land.
Step 1: Constitutional Basis.
Under Article 53(2) of the Constitution of India, the supreme command of the Defence Forces of the Union is specifically mentioned.
$\text{Article 53(2)} \rightarrow \text{Supreme Command is vested in the President}$
Step 2: Understanding the President's Role.
While the President is the Supreme Commander, it is important to note that the de facto (actual) executive control lies with the Prime Minister and the Cabinet, with the Defence Minister handling day-to-day administrative and strategic oversight. The President’s role is primarily ceremonial but legally supreme.
Step 3: Symbolic Significance.
The President, as the Head of State, represents the sovereignty of India. Having the President as the Supreme Commander ensures that the military remains loyal to the Constitution rather than to any individual political party or leader.
Final Answer: Option B