Which two statements about IP Source Guard are true? (Choose two)

Which two statements about IP Source Guard are true? (Choose two)
A . When it is first enabled, It blocks all IP packets except DHCP packets
B . It works together with DHCP snooping to verify source IP packets
C . When it is configured on a Layer 2 port channel, it is applied only to the port channel interface
D . When it is first enabled, It allows all IP packets except DHCP packets
E . It must be enabled globally for all ports
F . It is enabled automatically when DHCP snooping is enabled

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Answer: AB