The correct answer is option 4: Administrative Authority. Panchayat Samiti, also known as Block Panchayat, is a local government body at the block level in India. It is responsible for the administration and governance of the block or a group of villages within a district. Panchayat Samiti acts as an administrative authority, meaning it has the power to make decisions, implement policies, and carry out various administrative functions within its jurisdiction. It is involved in areas such as rural development, healthcare, education, infrastructure, and social welfare. While Panchayat Samiti may also have advisory, coordinating, and supervisory roles, the key role is its administrative authority to govern and administer the block.