Joe, a user, normally has access to internal network resources while in the office. Suddenly, his mobile device is not able to access any of the resources. Which of the following is the FIRST item to check in the troubleshooting process?
A. Whether the device is connected to the WiFi network
B. Whether the device is connected to the cellular network
C. Whether a VPN misconfiguration exists on the device
D. Whether a port misconfiguration exists on the device
