Refer to the exhibit. Which combination of IP address and subnet mask can be used on the serial interface of Router2 in order to put the interface in the same network as the serial interface of Router1?

IP 172.16.0.18, subnet mask 255.255.255.0
IP 172.16.32.15, subnet mask 255.255.255.240
IP 172.16.0.18, subnet mask 255.255.255.252
IP 172.16.32.18, subnet mask 255.255.255.252