What can happen by changing the mode of a VTP client to a VTP server and changing one of the VLANs?

A. The VLAN database can be overwritten in the rest of the network.
B. The VLAN database can be erased in the rest of the network.
C. The switch will need to be reloaded before it can function as a server.
D. Nothing; the switch functions fine in the rest of the network.

A. Since the VTP clients in the network check the revision number in VTP, if a client is changed to a server, the database remains intact. So when a change is made, the revision number will increment and propagate to the rest of the network. Even if an existing server exists, its revision number will be lower.