The answer is: Muhammad was the leader and founder of Islam in its origin, the companions spread the religion, and the first four caliphs expanded the Islamic Empire after Muhammad's death.
This statement is partially correct but contains inaccuracies. The Sunni-Shiite split occurred after the death of the fourth caliph, Ali, not immediately after Muhammad's death. The first four caliphs, known as the Rashidun Caliphs, ruled consecutively, not as separate leaders.
This statement is accurate. Muhammad is recognized as the founder of Islam. After his death, his companions played a crucial role in spreading the religion. The first four caliphs, known as the Rashidun Caliphs (Abu Bakr, Umar, Uthman, and Ali), significantly expanded the Islamic Empire.
This statement is incorrect. Allah is the deity in Islam, not a human leader or founder. Muhammad is the founder and prophet of Islam.
This statement is somewhat vague and misleading. While it is true that Muhammad's companions (Sahabah) played significant roles, the term "Așhāb people" is not commonly used in this context. The expansion of the Islamic Empire was primarily led by the first four caliphs.