Which two limitations of IP Source Guard are true? (Choose two.)

Which two limitations of IP Source Guard are true? (Choose two.)
A . It is supported only on packets switched in hardware.
B . It is supported only on ingress Layer 2 ports.
C . It is supported only on egress Layer 3 ports.
D . It is supported only an PAgP EtherChannels.
E . It is supported only on ingress Layer 3 ports.

Answer: AB