The correct option is "2 only." The Revamped Rashtriya Gram Swaraj Abhiyan (RGSA) is designed to enhance the governance capabilities of Panchayati Raj Institutions (PRIs) so they can effectively contribute to achieving the Sustainable Development Goals (SDGs), reflecting the Indian government's focus on decentralized governance and local self-governance. However, while the implementation period is indeed 1st April 2021 to 31st March 2026, the central funding does not constitute 100% support for all states and Union Territories, as it typically involves a shared funding model between the Centre and the states. This critical knowledge helps understand the framework of governance reforms in India, which is vital for questions related to rural development and federal governance structures often featured in UPSC examinations.