FortiGate is operating in NAT mode and is configured with two virtual LAN (VLAN) subinterfaces added to the same physical interface. In this scenario, what are ...

FortiGate is operating in NAT mode and is configured with two virtual LAN (VLAN) subinterfaces added to the same physical interface.
In this scenario, what are two requirements for the VLAN ID? (Choose two.)

A. The two VLAN subinterfaces can have the same VLAN ID, only if they have IP addresses in the same subnet. B. The two VLAN subinterfaces can have the same VLAN ID, only if they belong to different VDOMs. C. The two VLAN subinterfaces must have different VLAN IDs. D. The two VLAN subinterfaces can have the same VLAN ID, only if they have IP addresses in different subnets.