What is a Key feature of me ArubaOS firewall?

What is a Key feature of me ArubaOS firewall?
A . The firewall is stateful which means that n can track client sessions and automatically allow return traffic for permitted sessions
B . The firewall Includes application layer gateways (ALGs). which it uses to filter Web traffic based on the reputation of the destination web site.
C . The firewall examines all traffic at Layer 2 through Layer 4 and uses source IP addresses as the primary way to determine how to control traffic.
D . The firewall is designed to fitter traffic primarily based on wireless 802.11 headers, making it ideal for mobility environments

Answer: B