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.

Mounting the ISO and running the installation file is the correct way to install a program from an ISO file. An ISO file is an image of a disc that contains all the files and folders of a program. Mounting the ISO means creating a virtual drive that can access the ISO file as if it were a physical disc. Running the installation file means executing the setup program that will install the program on the computer

RDP (Remote Desktop Protocol) is a protocol that allows a user to connect to and control a remote computer over a network. RDP can be used to perform Windows updates on a department's servers without physically accessing them.

A rootkit (Option A) is a type of malware designed to gain administrative (root) access to a system while hiding its presence. Rootkits can manipulate system processes and files to remain undetected, making them particularly dangerous.
Trojan (Option B) is malware disguised as legitimate software but doesn't necessarily provide administrative access.
Worm (Option C) spreads across networks but doesn't grant administrative access.
Ransomware (Option D) encrypts data and demands a ransom but doesn't typically provide ongoing administrative access.
CompTIA A+ Core 2 Reference:
2.3 - Explain malware types, including rootkits and their purpose .

Detailed Explanation with Core 2 Reference:Configuring a proxy server in Windows 10 can be done through the Internet Options under LAN settings, where the user can enable and enter a proxy server's address. This aligns with Core 2's objectives of configuring network settings in a Windows environment (Core 2 Objective 1.4).