Detailed Explanation:

Answer: Option 3 — A mechanism of parliamentary democracy for ensuring collective responsibility of the Government to the people.

The Cabinet form of Government is a defining feature of parliamentary democracy where the Council of Ministers is collectively responsible to the legislature (Parliament). This principle is enshrined in Article 75(3) of the Indian Constitution, which mandates that the Council of Ministers shall be collectively responsible to the Lok Sabha.

Why Option 3 is Correct:
Collective responsibility means that Cabinet decisions bind all ministers, who must publicly support them even if they personally disagree. If Parliament passes a vote of no confidence, the entire Council of Ministers must resign, ensuring democratic accountability and preventing arbitrary executive rule.

Why Other Options are Incorrect:
❌ Option 1 – Incorrect: The Cabinet system is not designed to minimize criticism but to ensure accountability through collective responsibility to Parliament.
❌ Option 2 – Incorrect: While efficiency may be a benefit, the underlying principle is collective responsibility and accountability, not merely speeding up government activities.
❌ Option 4 – Incorrect: The Cabinet system is not a device to strengthen the head of government's hold over people, but to ensure collective decision-making and accountability to the legislature.