A customer requested a GRE tunnel through the provider network between two customer sites using loopback to hide internal networks. Which configuration on R2 establishes the tunnel with R1?
A.
R2(config)# interface Tunnel 1R2(config-if)# ip address 172.20.1.2 255.255.255.0R2(config-if)# ip mtu 1400R2(config-if)# ip tcp adjust-mss 1360R2(config-if)# tunnel source 192.168.20.1R2(config-if)# tunnel destination 192.168.10.1
B.
R2(config)# interface Tunnel 1R2(config-if)# ip address 172.20.1.2 255.255.255.0R2(config-if)# ip mtu 1400R2(config-if)# ip tcp adjust-mss 1360R2(config-if)# tunnel source 10.10.2.2R2(config-if)# tunnel destination 10.10.1.1
C.
R2(config)# interface Tunnel 1R2(config-if)# ip address 172.20.1.2 255.255.255.0R2(config-if)# ip mtu 1500R2(config-if)# ip tcp adjust-mss 1360R2(config-if)# tunnel source 192.168.20.1R2(config-if)# tunnel destination 10.10.1.1
D.
R2(config)# interface Tunnel 1R2(config-if)# ip address 172.20.1.2 255.255.255.0R2(config-if)# ip mtu 1500R2(config-if)# ip tcp adjust-mss 1360R2(config-if)# tunnel source 10.10.2.2R2(config-if)# tunnel destination 10.10.1.1
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