Which one of the following was appointed as Khalifa after the death of Mohammad Sahib, the Prophet ?

After the Prophet Muhammad died in 632 CE, the community chose Abu Bakr as the first Khalifa (Caliph). Umar was the second Caliph and Ali the fourth, and Abu Hanifa was an eighth-century jurist who founded the Hanafi school, not a Caliph.

The Shias hold that Ali should have succeeded the Prophet directly, and this dispute over succession is the root of the Sunni–Shia division that shapes Muslim personal law.