Explanation:

• The Ol Chiki script, also known as Ol Chemet' (Santali: ol ‘writing’, chemet’ ‘learning’), Ol Ciki, Ol, and sometimes as the Santali alphabet invented by Pandit Raghunath Murmu in the year 1925, is the official writing system for Santali, an Austroasiatic language recognized as an official regional language in India. It has 30 letters, the forms of which are intended to evoke natural shapes. Hence option 3rd is correct.