The correct answer is "2 only." The Global Alliance for Climate-Smart Agriculture (GACSA) was indeed launched at the Climate Summit in 2014, not 2015, making statement 1 incorrect. Membership in GACSA functions on a voluntary basis, meaning it does not impose binding obligations on member nations, which aligns with statement 2 being correct. While India did play a significant role in global climate discussions, it was not solely responsible for the formation of GACSA, thus making statement 3 misleading. This distinction is important for understanding international cooperative frameworks in addressing climate change while balancing national sovereignty and agricultural practices.