Which of the following statements about Amir Khusrau and his music are correct? I. Amir Khusrau studied the Daccani music of the Karnataka School. II. The great exponent of Deccani/ Karnataka music Naik Gopal was the contemporary of Amir Khusrau. III. Amir Khusrau applaud's his invention of sitar in his work Ghurrat al-Kamal. IV. Later works credit Amir Khusrau inventing about nineteen melodic forms, particularly khyal, tarana and qawl. Select the correct answer from the code given below: