An administrator deploys a WPA2 Enterprise wireless network with EAP-PEAP-MSCHAPv2. The deployment is successful and company laptops are able to connect automatically with no user intervention. A year later, the company begins to deploy phones with wireless capabilities. Users report that they are receiving a warning when they attempt to connect to the wireless network from their phones. Which of the following is the MOST likely cause of the warning message?
A. Mutual authentication on the phone is not compatible with the wireless network
B. The phones do not support WPA2 Enterprise wireless networks
C. User certificates were not deployed to the phones
D. The phones’ built in web browser is not compatible with the wireless network
E. Self-signed certificates were used on the RADIUS servers