Who among the following compiled the compositions of Baba Guru Nanak in Gurumukhi, also adding his own compositions to it?

Guru Angad, the second Sikh Guru, compiled the compositions of Baba Guru Nanak (the first Sikh Guru) and added his own compositions in a new script called Gurumukhi. Guru Arjan later compiled the Adi Granth (the holy Sikh scripture). Guru Gobind Singh was the tenth and last human Guru, and Guru Teg Bahadur was the ninth Guru. Hence Guru Angad is the correct answer.