What is required to create an inter-VDOM link between two VDOMs?

What is required to create an inter-VDOM link between two VDOMs?
A . At least one of the VDOMs must operate in NAT mode.
B . Both VDOMs must operate in NAT mode.
C . The inspection mode of at least one VDOM must be NGFW policy-based.
D . The inspection mode of both VDOMs must match.

Answer: A