Which configuration must the administrator perform to establish an iBGP session between routers PE1 on POP site 1 and PE2 on POP site 2?

Refer to the exhibit.

An administrator working for large ISP must connect its two POP sites to provide internet connectivity to its customers.

Which configuration must the administrator perform to establish an iBGP session between routers PE1 on POP site 1 and PE2 on POP site 2?
A . PE2#configure terminal
PE2(config)#router bgp 65111
PE2(config-router)#no neighbor 172.18.10.1 shutdown
PE2(config-router)#end
B. PE1#configure terminal
PE1(config)#router bgp 65111
PE1(config-router)#no neighbor 172.19.10.10 shutdown
PE1(config-router)#end
C. PE1#configure terminal
PE1(config)#router bgp 65111
PE1(config-router)#address-family ipv4 unicast
PE1(config-router-af)#neighbor 172.19.10.10 activate
PE1(config-router-af)#end
D. PE2#configure terminal
PE2(config)#router bgp 65111
PE2(config-router)#address-family ipv4 unicast
PE2(config-router-af)#neighbor 172.18.10.1 activate
PE2(config-router-af)#end

View Answer

Answer: B