Which is a true statement about extended VLANs?

A. You cannot configure extended VLANs until the normal VLANs are all used.
B. VTP versions 1 and 2 require the switch to be in transparent mode.
C. Extended VLANs are saved in the VLAN database.
D. Extended VLANs can only be used for FDDI.

B. By default, the VTP mode is server. VTP v1 and v2 do not support storage and propagation of extended VLANs. However, when the switch is put into transparent mode, it does not participate in VTP, so the VLANs can be configured.