正解:B
You can map a VLAN on the local site to a VLAN with a different VLAN ID on the remote site.
When you map two VLANs with different VLAN IDs across sites, they get mapped to a common VLAN called the transport VLAN. For example, when you map VLAN 1 on Site A to VLAN 2 on Site B, both VLANs are mapped to a transport VLAN. All traffic originating from VLAN 1 on Site A is translated as going from the transport VLAN. All traffic arriving at Site B from the transport VLAN is translated to VLAN 2.
Reference:
https://www.cisco.com/c/en/us/support/docs/switches/nexus-7000-series-switches/200998- Nexus-7000-OTV-VLAN-Mapping-on-Overlay.html? dtid=osscdc000283