Who added second Azan for Friday prayers?

a) Hazrat Abu Bakr (R.A)

b) Hazrat Umar (R.A)

c) Hazrat Usman (R.A)

d) None of these

Hazrat Usman (R.A), the third Caliph of Islam, added 2nd Azan for Friday Prayer (Namaz-e-Jumma).