You are trying to reprovision a switch in a different part of your network. However, you still see the old VLANs configured from the old network. How can you rectify the problem?

A. Upgrade the IOS.
B. Type erase startup-config, confirm it, and reload.
C. Type clear vlan, confirm it, and reload.
D. Delete the vlan.dat, confirm it, and reload.

D. The vlan.dat is the database for VLANs configured on a switch either manually or through VTP. It is persistent even if config.text (startup-config) is deleted. You must manually delete the vlan.dat.