Which of the following should you confirm if your wireless keyboard is not working?

When troubleshooting a non-working wireless keyboard, confirming that the device driver is installed is crucial because the driver facilitates communication between the operating system and the keyboard. If the driver is missing or not functioning correctly, the keyboard will not be recognized by the computer, rendering it unusable.

The device driver is software that allows the operating system to interface with the hardware devices. Without the proper driver, even if the keyboard is powered on and connected through a USB receiver, the system will not be able to understand the input it receives from the keyboard.

In the context of the other options, checking the keyboard batteries is also essential because depleted batteries can certainly cause functionality issues. However, if the driver is not installed, the keyboard would not work regardless of the battery status. Likewise, confirming that the USB receiver is properly plugged in is important as the receiver is the link between the keyboard and the computer. However, if the driver is not installed, effective communication cannot happen. The keyboard layout settings can impact how keystrokes are interpreted but do not affect the fundamental connection or recognition of the keyboard by the system, which is why ensuring the driver installation takes precedence.