Which of the following are the key features of 'National Ganga River Basin Authority (NGRBA)'? 1. River basin is the unit of planning and management. 2. It spearheads the river conservation efforts at the national level. 3. One of the Chief Ministers of the States through which the Ganga flows becomes the Chairman of NGRBA on rotation basis. Select the correct answer using the code given below.

Option (a) is correct because the NGRBA was established under the Environment (Protection) Act, 1986, to shift from a town-centric approach to a holistic river-basin approach for planning and spearheading national conservation efforts. Statement 3 is incorrect because the Prime Minister of India serves as the ex-officio Chairman of the Authority, while the Chief Ministers of the riparian states are members, not rotating chairs. The core concept tested is the institutional governance and statutory framework of major environmental conservation bodies in India.