Which statements about virtual interfaces are correct? (Multiple choice)

Which statements about virtual interfaces are correct? (Multiple choice)
A . The virtual interface may cause the protocol layer DOWN because the IP address is not configured.
B . The virtual interface must be added to the security zone to work.
C . The virtual interface may not be configured with an IP address.
D . A virtual interface is a logical interface for which an IP address needs to be configured.

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Answer: BC