The system administrator has been notified that many users are having difficulty connecting to the company’s wireless network. They take a new laptop and physically go to the access point and connect with no problems. Which of the following would be the MOST likely cause?
A. The certificate used to authenticate users has been compromised and revoked.
B. Multiple war drivers in the parking lot have exhausted all available IPs from the pool to deny access.
C. An attacker has gained access to the access point and has changed the encryption keys.
D. An unauthorized access point has been configured to operate on the same channel.