Which two statements describe application-layer gateways (ALGs)? (Choose two.)

Which two statements describe application-layer gateways (ALGs)? (Choose two.)
A . ALGs are designed for specific protocols that require multiple sessions.
B . ALGs are used with protocols that use multiple ports.
C . ALGs can only be configured using Security Director.
D . ALGs are designed for specific protocols that use a single TCP session.

Answer: A,B