Guru Arjun Dev (1563-1606) was the fifth Sikh Guru who compiled the Adi Granth, but he did NOT develop the Gurumukhi script. The Gurumukhi script was standardized earlier, during the time of Guru Angad Dev (second Guru, 1504-1552), who refined and promoted it for recording Sikh scriptures. This makes statement C factually incorrect, while the other statements are historically accurate.