A user replaces a laptop’s wireless PCMCIA card with a different vendor’s card. All of the new card configuration steps have been followed. The OS sees all known wireless networks but cannot connect to the user’s network. Which of the following is the MOST likely reason for this behavior?（）

• A、DMZ is enabled.
• B、MAC filtering is enabled.
• C、WEP is being used.
• D、SSID broadcast is disabled.