What can be the reasons for that?

An administrator observes that the port1 interface cannot be configured with an IP address.

What can be the reasons for that? (Choose three.)
A . The interface has been configured for one-arm sniffer.
B . The interface is a member of a virtual wire pair.
C . The operation mode is transparent.
D . The interface is a member of a zone.
E . Captive portal is enabled in the interface.

Answer: A B C

Explanation:

https://help.fortinet.com/fos50hlp/54/Content/FortiOS/fortigate-whats-new-54/Top_VirtualWirePair.htm