A FortiGate is operating in NAT/Route mode and configured with two virtual LAN (VLAN) sub-interfaces added to the same physical interface.

Which statement about the VLAN IDs in this scenario is true?

A. The two VLAN sub-interfaces can have the same VLAN ID only if they belong to different VDOMs.

B. The two VLAN sub-interfaces must have different VLAN IDs.

C. The two VLAN sub-interfaces can have the same VLAN ID only if they have IP addresses in the same subnet.

D. The two VLAN sub-interfaces can have the same VLAN ID only if they have IP addresses in different subnets.