Your customer reports he just bought a new laptop and he cannot log on to his wireless router with it. You verify the wireless NIC is working, you can see the wireless routers network, and you verify the customer is using the correct username and password. What is the most likely cause of this problem?

A.
The router has a virus.

B.
His new laptop is not compatible with the router.

C.
MAC filtering is enabled.

D.
The router has maximum connections now.