Explanation:
UPS > Surge protector = Computer, wifi router, cable modem
Surge protector = wallOutlet , printer and scanner

The first step a technician should take when troubleshooting a computer with a suspected short in the power supply is B. Disconnect the power before servicing the PC. This is to prevent any electrical shock or damage to the components. A power supply can be dangerous even when unplugged, as capacitors can maintain a line voltage charge for a long time1. Therefore, it is important to disconnect the power cord and press the power button to discharge any residual power before opening the case2. The other steps are also important for safety and proper diagnosis, but they should be done after disconnecting the power.

Restarting services can resolve issues with web applications without requiring a full server reboot, which aligns with the company policy.
* Restart services: Likely to resolve issues with the web application by refreshing the necessary services.
* Roll back Windows updates: Unnecessary if the issue is with the application services.
* Perform a Windows repair: More disruptive and not typically needed for application service issues.
* Add RAM to the server: Would require a reboot and is not immediately necessary for troubleshooting application issues.
Reference: CompTIA A+ Exam Objectives [220-1102] - 3.1: Given a scenario, troubleshoot common Windows OS problems.

WPA2 is the only protocol among the options that supports fast roaming between networks. Fast roaming, also known as IEEE 802.11r or Fast BSS Transition (FT), enables a client device to roam quickly in environments implementing WPA2 Enterprise security, by ensuring that the client device does not need to re-authenticate to the RADIUS server every time it roams from one access point to another1. WEP, WPA, LEAP, and PEAP do not support fast roaming and require the client device to perform the full authentication process every time it roams, which can cause delays and interruptions in the network service.
References:
* The Official CompTIA A+ Core 2 Study Guide2, page 263.
* WiFi Fast Roaming, Simplified3

To resolve a BSOD issue on a Windows 10 PC after installing optional Windows updates, the best approach is to Roll back the device drivers (B). BSODs can often be caused by incompatible or faulty drivers introduced during an update. Rolling back the drivers to a previous version can restore system stability and resolve the BSOD issue.