Which Caliph of the following launched the postal department? A) Hazrat Abu Bakr R.A B) Hazrat Umar R.A C) Hazrat Usman R.A D) Hazrat Ali R.A Related MCQs: Give the name of Ummayad Caliph whose four sons also became Caliph after him? Department of Police was developed by which Caliph? In the fourteen points presented by the Quiad-e-Azam in 1929, he demanded reforms in which of the following provinces? Who among the following chaired the annual meeting of the All India Muslim League in 1907?