Explanation:

- Statement 1: Incorrect. NCGG was not set up by the Sardar Vallabhbhai Patel National Police Academy. It was established by the Government of India for good governance practices.

- Statement 2: Correct. The National Institute of Administrative Research (NIAR) was indeed rechristened and integrated into the NCGG.

- Statement 3: Incorrect. NCGG is not under the Ministry of Home Affairs; it's under the Department of Administrative Reforms and Public Grievances.

- Statement 4: Correct. The Chairperson of the Governing Body of NCGG is indeed the Cabinet Secretary to the Government of India.

- Option Analysis: Option 2 (Statements 2 and 4 only) is correct