A client reports to Karen, a technician, that he cannot connect to the Internet. The ipconfig command reveals the below information: Which of the following is the MOST likely cause of the problem?（）

• A、Windows does not recognize the 192.168.1.0 subnet as valid.
• B、The subnet mask is improperly configured.
• C、The default gateway is not in the same subnet.
• D、The IP address is not a private address.