With reference to Indian texts, which of the following statements are INCORRECT?

I. The Natyashastra, written by Bharatamuni, deals with dance, music and drama.

II. The text 'Devichandraguptam', written by Vishakhadatta, is a 6th century political drama about the rise of ruler Chandragupt Maurya.

III. The Manusmriti is a Buddhist text about Sangha rules and regulations.

Choose the correct option: