Explanation
The desktop specialist should use a clean install to refresh the laptop. A clean install will remove all data and applications from the laptop and install a fresh copy of Windows 10, ensuring that the laptop is ready for the newly hired employee.

Explanation
The smartphone's line was not provisioned with a data plan. The user is unable to use any internet-related functions on the smartphone when it is not connected to Wi-Fi because the smartphone's line was not provisioned with a data plan. The user can send and receive text messages and phone calls when the smartphone is not connected to Wi-Fi because these functions do not require an internet connection1

Explanation
NFC stands for Near Field Communication, and it is a wireless technology that allows your phone to act as a contactless payment device, among other things2. Payment applications that allow payments to be made with a mobile device usually rely on NFC to communicate with the payment terminal1. Therefore, if NFC is disabled on the phone, the payment will not work. To enable NFC on an Android phone, you need to follow these steps
3:
On your Android device, open the Settings app.
Select Connected devices.
Tap on Connection preferences.
You should see the NFC option. Toggle it on.
The other options are not directly related to using a payment application with a mobile device. Airplane mode is a setting that disables all wireless communication on the phone, including NFC4, but it also affects calls, texts, and internet access. Bluetooth is a wireless technology that allows you to connect your phone with other devices such as headphones or speakers, but it is not used for contactless payments. Wi-Fi is a wireless technology that allows you to access the internet or a local network, but it is also not used for contactless payments. Location services are a feature that allows your phone to determine your geographic location using GPS or other methods, but they are not required for contactless payments.

Explanation
A battery backup, also known as an uninterruptible power supply (UPS), is a device that provides backup power during a power outage. When the power goes out, the battery backup provides a short amount of time (usually a few minutes up to an hour, depending on the capacity of the device) to save any work and safely shut down the equipment.

Explanation
Local Users and Groups is a Microsoft Management Console (MMC) snap-in that allows you to manage user accounts or groups on your computer1. If you cannot find it in the MMC console, you can add it manually by following these steps2:
Press Windows key + R to open the Run dialog box, or open the Command Prompt.
Type mmc and hit Enter. This will open a blank MMC console.
Click File and then Add/Remove Snap-in.
In the Add or Remove Snap-ins window, select Local Users and Groups from the Available snap-ins list, and click Add.
In the Select Computer window, choose Local computer or Another computer, depending on which computer you want to manage, and click Finish.
Click OK to close the Add or Remove Snap-ins window. You should now see Local Users and Groups in the MMC console.