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The National Ganga River Basin Authority (NGRBA) is characterized by several key features. Option 1 is correct since river basin is indeed the unit of planning and management under NGRBA, not the individual rivers. This is integral to its holistic approach to managing the river ecosystem. Also, the statement under option 2 is also correct- NGRBA spearheads the conservation efforts of the Ganga river at the national level such as restoration and maintenance of environmental sanitation. However, the third statement is not correct, as the chairman of NGRBA is the Prime Minister, not a rotational Chief Minister of the States through which Ganga flows. Therefore, the correct answer consists of statements 1 and 2, and not statement 3. Hence, the answer is option 1 - `1 and 2 only`.