Who compiled the Adi Granth and installed it at Harmandir Sahib in 1604?

Guru Arjan is the defensible answer to this advanced Medieval History question. Guru Arjan compiled the Adi Granth, including compositions of Sikh Gurus and selected bhagats, and installed it at Harmandir Sahib in 1604. Bhakti and Sufi traditions were diverse rather than a single uniform movement. Region, language, chosen deity, institutional setting and attitude to ritual help distinguish one saint or order from another. The distractors need separate rejection: Guru Nanak belongs to a different institution, context or chronology; Guru Hargobind does not perform the function described in the stem; and Guru Gobind Singh fails the required association. The wording of “Who compiled the Adi Granth and installed it at Harmandir Sahib in 1604?” is deliberately specific, so the candidate should isolate its operative clue before recalling names. A useful method is to construct a two-step link from the tested term to its function and then from that function to the relevant ruler, text, monument or region. The fact is significant beyond one MCQ because it reveals how medieval institutions worked in practice and how historians classify the surviving evidence. — Guru Arjan”, but also remember the factual reason stated above.