Which Filtering Rule of a Firewall Is More Likely a 'Stateful

Multiple Choice

Which filtering rule of a firewall is more likely a 'stateful' rule than the others?

A) If source IP = 172.16.x.x to 172.31.x.x or 192.168.x.x, then drop the packet.
B) If TCP destination port = 21, then allow the packet. ‏
C) If HTML message contains 'sex' or 'entertainment', then drop the packet. ‏
D) If destination IP = 161.154.23.59 and TCP port = 25, then allow the packet.
E) If source=192.168.1.34, dest.=163.43.24.11, source port=1075, dest. port=21, then allow the packet.