Explanation:

- Guru Angad (Option 4): Guru Angad, the second Sikh Guru, developed the Gurmukhi script. He adapted the script to make the teachings of Guru Nanak more accessible to the common people. Gurmukhi became pivotal in preserving Sikh religious texts.

- Guru Ram Das (Option 1): The fourth Sikh Guru credited with founding the city of Amritsar. He is noted for his contributions to the Sikh community and traditions but not for developing the Gurmukhi script.

- Guru Hargobind (Option 2): The sixth Sikh Guru known for militarizing the Sikh community and promoting the concept of Miri and Piri (spiritual and temporal authority).

- Guru Tegh Bahadur (Option 3): The ninth Sikh Guru remembered for his sacrifice to protect religious freedom. He played a crucial role in Sikh history but not related to the development of the Gurmukhi script.