The correct answer is option 4: 1 and 3 only. The Charvaka school of philosophy, also known as Lokayata, was an atheistic school of thought that originated in ancient India. It rejected the idea of an afterlife, the existence of gods, and the concept of karma. It focused mainly on materialism and sensual pleasure.

Dhurtta is one of the Charvaka schools of philosophy. It emphasized the importance of cleverness and deceit in order to achieve success in life. This philosophy advocated for the pursuit of personal gain and the maximization of pleasure.

Sushikshita, on the other hand, is not a Charvaka school of philosophy. It does not align with the principles and beliefs of the Charvakas. Sushikshita is a Sanskrit word that means "well-educated" or "well-instructed."

Nyaya and Vaisheshika are not Charvaka schools of philosophy either. Nyaya is a school of logic and reasoning, while Vaisheshika is a school of atomism and metaphysics. Both these schools of thought are separate from the teachings of Charvaka.

Therefore, the correct answer is option 4: 1 and 3 only.