Which is not considered a firewall architecture used to protect networks?

Which is not considered a firewall architecture used to protect networks?

A.
Screened host

B.
Screened subnet

C.
NAT gateway

D.
Dual-homed host

Explanation:
The other answers describe basic firewall architectures, meaning where
they can be placed within an environment. Network address translation (NAT) maps
public to private addresses and does not provide traffic monitoring capabilities.
Some firewalls provide NAT services, but the goals of the services are different.