For a dedicated DLP Gateway that runs in inline bridge mode, why is it important to properly define

For a dedicated DLP Gateway that runs in inline bridge mode, why is it important to properly define the topology?

A.
Topology definition is necessary for correct anti-spoofing.

B.
Topology is used for Hide NAT.

C.
By default. My Organization is defined by the internal interfaces of a DLP Gateway.

D.
Topology definition is used for VPN communities definition.