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