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

1. A

   1 and 2 only

   1 and 2 only. NGRBA (2009) takes the river basin as the planning unit and leads national Ganga conservation. The Prime Minister chairs it; Chief Ministers of basin States are members, not rotating chairs. That stored letter is the official key.

2. B

   2 and 3 only

   2 and 3 only. National spearhead is right, but the rotating-CM chair is false, so this pairing is not the key.

3. C

   1 and 3 only

   1 and 3 only. Basin-scale planning is right; statement 3 on the chair is not. This letter is not the key.

4. D

   1, 2 and 3

   All three. Statement 3 fails, so all three cannot be the key.

Summary. Official key is (a) 1 and 2 only. NGRBA plans at basin scale and coordinates nationally under the Prime Minister, not a rotating Chief Minister. Honour the stored letter (a).