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 ingress Layer 2 ports
B . It is supported only on ingress Layers 3 ports
C . It is supported only on packets switched in hardware
D . It is supported only on PAgP EtherChannels.
E . It is supported only on egress Layer 3 ports

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Answer: AC