In which of the following is reference of Indian Dance forms found?

The correct answer is Option (2) - Natya Shashtra

The reference to Indian dance forms is found in the ancient Indian text "Natya Shastra." This text, attributed to the sage Bharata Muni, is one of the earliest treatises on performing arts, including dance, music, and theater. It provides detailed descriptions of various aspects of Indian classical dance forms, their techniques, gestures (mudras), and aesthetics.