Flashing the BIOS, reformatting the drive, and then reinstalling the OS is the best method for returning a computer with a malware infection to service. Flashing the BIOS updates the firmware of the motherboard and can remove any malware that may have infected it. Reformatting the drive erases all data on it and can remove any malware that may have infected it. Reinstalling the OS restores the system files and settings to their original state and can remove any malware that may have modified them. Scanning the system with a Linux live disc may not detect or remove all malware infections. Degaussing the hard drive is an extreme method of destroying data that may damage the drive beyond repair. Reinstalling the OS before flashing the BIOS or scanning with antivirus may not remove malware infections that persist in the BIOS or other files.

Detailed Explanation with Core 2 Reference:Bollards are physical barriers that prevent unauthorized vehicle access to certain areas, providing a preventive measure against unauthorized entry and potential threats. Bollards are classified as a preventive control because they act to deter or block physical access to secured locations, as opposed to video surveillance or alarm systems, which are typically used for detection and monitoring. Core 2 highlights the importance of implementing various physical security controls to protect assets and infrastructure (Core 2 Objective 2.1).

User awareness education is the most effective method for reducing phishing attacks. Training users to recognize suspicious emails, links, and attachments can prevent them from falling for phishing attempts. Technical solutions like SMTP filtering (C) and restricting emails (D) can help but are not as effective without user vigilance. A BYOD policy (B) does not directly address phishing email threats.

Detailed Explanation with Core 2 Reference:The PC is likely infected with ransomware. The immediate step should be to disconnect from the network to prevent the malware from spreading to other devices. Core 2 highlights steps to respond to malware incidents, such as disconnecting from the network as part of containment measures (Core 2 Objective 2.3).

Running an antivirus scan for malicious software is the first step that a support technician should do when a user reports a virus on a PC. The antivirus scan can detect and remove the virus, as well as prevent further damage or infection. Quarantining the host, investigating how the malware was installed and reimaging the computer are possible steps that can be done after running the antivirus scan, depending on the situation and the results of the scan. Verified Reference: https://www.comptia.org/blog/how-to-remove-a-virus https://www.comptia.org/certifications/a