Joe, a vendor, walks into a customer’s site with a laptop. While waiting for his contact to arrive, he
wants to check his email. He discovers the SSID for the site’s wireless network and receives a
valid guest password from the receptionist. He is, however, unable to connect. Which of the
following is MOST likely the problem?

A.
The customer’s wireless router uses WPA encryption.

B.
The wireless router at the customer’s site is configured with MAC filtering.

C.
The customer’s WAP uses WEP encryption.

D.
The customer’s IT department blocks all visitors from connecting to their network.