What is a potential drawback to leaving VLAN 1 as the native VLAN?

What is a potential drawback to leaving VLAN 1 as the native VLAN?
A . It may be susceptible  to a VLAN hoping attack.
B . Gratuitous ARPs might be able to conduct a man-in-the-middle attack.
C . The CAM might be overloaded, effectively turning the switch into a hub.
D . VLAN 1 might be vulnerable to IP address spoofing.

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Answer: A