What is a valid OS10 iBGP configuration?

What is a valid OS10 iBGP configuration?
A . S2(config)# router bgp 64507
S2(config-router-bgp-64507)# peer-as 64507
S2(config-router-bgp-64507)# neighbor 192.168.32.1
S2(config-router-neighbor)# update-source loopback 0
S2(config-router-neighbor)# no shutdown
B . S2(config)# router bgp 64507
S2(config-router-bgp-64507)# neighbor 192.168.32.1
S2(config-router-bgp-64507)# remote-as 64507
S2(config-router-bgp-64507)# update-source loopback 0
S2(config-router-bgp-64507)# no shutdown
C . S2(config)# router bgp 64507
S2(config-router-bgp-64507)# neighbor 192.168.32.1
S2(config-router-neighbor)# remote-as 64507
S2(config-router-neighbor)# update-source loopback 0
S2(config-router-neighbor)# no shutdown
D . S2(config)# router bgp 64507
S2(config-router-bgp-64507)# remote-as 64507
S2(config-router-bgp-64507)# neighbor 192.168.32.1
S2(config-router-neighbor)# update-source loopback 0
S2(config-router-neighbor)# no shutdown

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Answer: C