A network administrator wants to implement MAC filtering for the wireless network of a local financial firm to ensure that only employees can access the wireless network. What is a potential weakness of this solution?

A. MAC filters cannot be applied with WPA2 encryption.

B. Authorized MAC addresses are visible in plaintext in the air and can be easily spoofed.

C. Many popular clients do not have the capability to connect to WLANs that use MAC filters.

D. MAC filters offer no protection against authorized users who try to connect unauthorized devices.