The correct answer is option 1, Abu`l Hasan al Hujwiri.

Abu`l Hasan al Hujwiri, also known as Data Ganj Bakhsh, was a Persian Sufi and a scholar of the 11th century. He is famous for his work called Kashf-ul-mahjub, which is considered to be one of the earliest and most influential treatises on Sufism.

Option 2, Moinuddin Chishti, was a 13th-century Sufi saint and philosopher from India. Although he was a prominent figure in Sufism, he was not the author of Kashf-ul-mahjub.

Option 3, Shaikh Nizamuddin Auliya, was a 14th-century Sufi saint and poet from India. While he had a significant impact on Sufism, he did not write Kashf-ul-mahjub.

Option 4, Amir Khusrau, was a 13th-century Persian poet and scholar. Although he was a contemporary of Abu`l Hasan al Hujwiri, he did not write Kashf-ul-mahjub.

In conclusion, Abu`l Hasan al Hujwiri, also known as