Explanation:

1, 2 and4

CAG of India: Constitutional Provisions
Part V of the Indian Constitution describes the role and responsibilities of this office in Chapter V. The Comptroller and Auditor General is one of the few offices directly appointed by the President of India.

Powers of the Comptroller and Auditor General of India
Article 148 of the Constitution of India establishes the authority of this office. It states the following points in relation to the establishment and powers of CAG:

The Comptroller and Auditor General is appointed by the President of India and can be removed from office only in the manner and on the grounds that a Judge of the Supreme Court is removed.
The person appointed to this office should take an oath of office before the President or any other person appointed by the office of the President.
The salary, service conditions, leaves of absence, pension, and age of retirement are determined by the Parliament of India and specified in the Second Schedule such that the service conditions and salary will not be modified to the disadvantage of the incumbent during their tenure.
The CAG is not eligible for any further office after the end of their tenure either in the Government of India or any State Government.
The powers and functions of the CAG are subject to the provisions of the Indian Constitution and any Acts of Parliament, along with the service conditions for the Indian Audits and Accounts Department. The rules governing these would be prescribed by the President in consultation with the incumbent.
The expenses on the administration of this office including all allowances, salaries and pensions would be charged to the Consolidated Fund of India.
The incumbent is appointed for a period of 6 years or until attaining the age of 65 years whichever is earlier.