Which list places events in the correct sequence?
`Abu Bakr unifies followers, Muhammad dies, Umayyad Caliphate caliphate established, Arab Muslims defeat Byzantines and Persians, Abbasid Caliphate caliphate established
`Arab Muslims defeat Byzantines and Persians, Muhammad dies, Abu Bakr unifies followers, Abbasid Caliphate caliphate established, Umayyad Caliphate caliphate established
`Muhammad dies, Abu Bakr unifies followers, Arab Muslims defeat Byzantines and Persians, Umayyad Caliphate caliphate established, Abbasid Caliphate caliphate established
`Muhammad dies, Abu Bakr unifies followers, Arab Muslims defeat Byzantines and Persians, Abbasid Caliphate caliphate established, Umayyad Caliphate caliphate established
