Which Muslim Caliph had all his four sons caliph too?کس مسلمان خلیفہ کے چاروں بیٹے بھی خلیفہ تھے؟AHazrat Umar (RA)BAbdul Malik bin MarwanCHazrat Abu Bakr (RA)DNone of theseShow the answeror pick an option above