Option a is the correct answer. Ragamala is a Sanskrit work on music by Pundrik Vitthal, a famous singer and composer of Indian music. He wrote it according to the instructions of Raja Mansingh, and adopted the family-raga-system for the classification of ragas. Rasa Kaumudi is a Sanskrit work on music by Sri Kantha, a contemporary and student of Pundrik Vitthal. He was a court poet of Satrusalya. Rasa Kaumudi deals with vocal and instrumental music, dance, drama, rasa and proper conduct of king. Raga Vibodh is a Sanskrit work on music by Somanath, a resident of Rajmundry. He described his ragas in terms of Janya-Janak or Thata-Raga system. He also gave a description of different kinds of veenas. Chaturdandi Prakashika is a Sanskrit work on music by Venkatraman, an Indian poet, musician, and musicologist of Carnatic music. Chaturdandi Prakashika introduced a theoretical melakarta system to classify and organise ragas in the Carnatic music tradition of India.