Which of the Following Accurately Describes the Origins of the Fatimid

Which of the following accurately describes the origins of the Fatimid regime?

A) The Fatimids began when a Shiite religious and military leader overthrew the Sunni ruler in Egypt.
B) The Fatimids established themselves as a Sunni regime and refused to acknowledge the legitimacy of the Abbasid caliphs.
C) The Fatimids began as religious purifiers, who destroyed earlier centers of learning that had attracted Islamic scholars from all over Afro-Eurasia.
D) The Fatimids brought the Egyptian population into the Shiite faith and established Egypt as the primary base for Shiism.