The correct answer is option 4 - 1, 2 and 3.

1. The Public Accounts Committee is a Committee of Parliament. It is responsible for examining the audit reports of the Comptroller and Auditor General (CAG) and ensuring financial accountability of the government.

2. The Estimates Committee, also known as the Committee on Estimates, is another Committee of Parliament. Its main role is to examine the estimates of expenditure proposed by the government and suggest economy, efficiency, and improvement in the allocation and utilization of resources.

3. The Committee on Public Undertakings is also a Committee of Parliament. Its key function is to examine the reports and accounts of government-owned corporations and companies to ensure their efficient functioning and proper utilization of resources.

Therefore, all three Committees mentioned in the options - Public Accounts Committee, Estimates Committee, and Committee on Public Undertakings are Committees of Parliament.