The correct option is Guru Angad.

Guru Angad Dev Ji, the second of the ten Sikh Gurus, played a key role in standardizing and popularizing the Gurmukhi script in the 16th century.
While the script existed in raw forms before him, he refined and systematized the characters to make it easy for common people to read, write, and understand the Punjabi language. This standardization helped in preserving the holy hymns and teachings of the Sikh Gurus, making spiritual literature accessible to all sections of society.