$8.$ You want to delete VLAN $1$ for security reasons. However, the switch will to let you. What is the reason you cannot delete VLAN $1?$

Select one:

a$.$

The VLAN serves as the switch's main management IP$.$

b$.$

The VLAN is still configured on a port.

c$.$

The VLAN is still configured as a native VLAN on a trunk?

d$.$

The VLAN is protected from deletion.