WORLD HISTORY

Detailed explanation-1: -The first four leaders of the community who followed Muhammad in the 7th century are considered the purest expression of the caliphate-Abu Bakr, Omar, Othman and Ali.

Detailed explanation-2: -Muhammad had not named a successor. A successor is a person who replaces another person in an office or position. He also had not told his followers how to choose a successor. The Muslim community selected Abu-Bakr as Muhammad’s successor, Abu-Bakr was respected for his devotion to Muhammad and to Islam.