While using a secure conference call connection over a corporate VPN, a user moves from a cellular connection to a hotel wireless network. Although the wireless connection and the VPN show a connected status, no network connectivity is present. Which of the following is the MOST likely cause of this issue?


A. MAC filtering is configured on the wireless connection.
B. The VPN and the WLAN connection have an encryption protocol mismatch.
C. The WLAN is using a captive portal that requires further authentication.
D. Wireless client isolation is enforced on the WLAN settings.