After the Battle of Yermuk, which was won by the Muslims Khalid bin Waleed was removed by the Caliph Umar (RA) from his supreme command. The new Supereme Commander was?
A. Amr bin Al Aas (RA) B. Abu Ubaydah (RA)
C. Saad bin Abi Waqas (RA)
D. Hazrat Bilal (RA)