Use A for this item. A switch added to an existing VTP domain must not have a higher revision number than the production database. A lower revision number prevents the old switch from overwriting current VLAN information. In Cisco CCNA 200-301 v1.1, Network Access questions frequently test the practical boundary between similar features: what the feature does, where it is configured, and what problem it is meant to solve. Dynamic trunking settings do not protect the VLAN database, and a higher revision number is exactly the dangerous condition. A clean way to validate the answer is to map the wording of the scenario to the actual device function. If the feature supplies addressing, forwarding, authentication, trunking, route selection, or controller communication, the answer must match that function exactly rather than a nearby protocol name.