Islamic study

He adopted the title of Ameer-ul-Momineen for the first time?

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(a) Hazrat Abu Babar (RA)
(b) Hazrat Umar (RA)
(c) Waleed bin Abdil Malik (RA)
(d) Hazrat Ali (RA)

See also  Name the person whose house became the centre of preaching of Islam?