How did Sunnites differ from Shi'ites on the issue of who should succeed Muhammad?
a) Sunnites believe in hereditary succession; Shi'ites believe in election
b) Sunnites believe in election; Shi'ites believe in divine appointment
c) Sunnites believe in democratic election; Shi'ites believe in monarchy
d) Sunnites believe in consultation; Shi'ites believe in direct appointment
