Option b is the correct answer. Abhinav Gupta is not related to the philosophy of Vedanta, but rather to the philosophy of Kashmir Shaivism. It is a school of Hindu philosophy belonging to the Tantric tradition. Abhinavagupta was a 10th-11th century philosopher, mystic and aesthetician from Kashmir, who wrote extensively on topics such as metaphysics, epistemology, aesthetics, theology, logic, and ethics. He was also a polymath who excelled in music, poetry, drama, and exegesis. He is considered one of the greatest thinkers and writers of Indian history.