Which of the following firewall types inspects Ethernet traffic at the MOST levels of the OSI model?

Which of the following firewall types inspects Ethernet traffic at the MOST levels of the OSI
model?

A.
Packet Filter Firewall

B.
Stateful Firewall

C.
Proxy Firewall

D.
Application Firewall

Explanation:
Stateful inspections occur at all levels of the network.