Multicast IP addresses are in the range of 224.0.0.0 to 239.255.255.255.
Looking at the options provided:
- 221.22.20.2 - This is not a multicast address (it's in the range of unicast addresses).
- 223.3.40.2 - This is not a multicast address (it's also in the range of unicast addresses).
- 238.20.80.4 - This is a multicast address (it falls within the 224.0.0.0 to 239.255.255.255 range).
- 240.34.22.12 - This is not a multicast address (it's in the range of experimental addresses).
Thus, the multicast IP address from the options is 238.20.80.4.