Who added second (2nd) Azan for Friday prayers?

a) Hazrat Abu Bakr (R.A)

b) Hazrat Umar (R.A)

c) Hazrat Usman (R.A)

d) Hazrat Ali (R.A)

Hazrat Usman Bin Affan (R.A), the third caliph of Islam, introduced the second (2nd) Azan (call for prayer) before Friday prayers.