Comprehensive and Detailed Explanation From Exact Extract:
Background applications can significantly drain a smartphone's battery, even when the device is idle. A technician should first review which apps are running in the background and consuming power through the battery usage section of the OS. Disabling or restricting power-hungry apps often resolves poor battery life.
A). Storage usage doesn't significantly affect battery life.
B). End of software support is unrelated to battery performance unless it's causing inefficient processes, which would still be secondary.
C). Charger wattage affects charging speed, not battery life after charging.
Reference:
CompTIA A+ 220-1102 Objective 3.3: Troubleshoot common mobile OS and application issues.
Study Guide Section: Diagnosing battery and app performance issues on mobile devices

See Explanation below for complete solution.
Explanation:
Host 2, Host 3, Host 4 , Host 5 ,Host 6, Host 7, Host 8 , Media Server - Stop All unwanted and malicious service (Persistance.j1zpxn Installer Service) from all the listed host and Media servers Refer screenshot below on the required service started/stopped on host2, same service to be started and stopped across all host servers.

A screenshot of a computer AI-generated content may be incorrect.

A screenshot of a computer AI-generated content may be incorrect.

Comprehensive and Detailed Explanation From Exact Extract:
To ensure the authenticity of a downloaded application, the most reliable method is to verify the file's hash (e.
g., SHA256, MD5) against the value provided by the legitimate vendor. If the hash values match, the file has not been altered or tampered with. This verification confirms the integrity and authenticity of the executable.
B: Process IDs are dynamic and not unique to specific software.
C: Running in safe mode doesn't validate legitimacy-it only runs the app in a minimal environment.
D: File names can be spoofed; matching the name does not prove authenticity.
Reference:
CompTIA A+ 220-1102 Objective 2.2: Compare and contrast authentication and software integrity verification methods.
Study Guide Section: Hash verification for software authenticity and digital integrity

Comprehensive and Detailed Explanation From Exact Extract:
Persistent pop-ups urging antivirus updates are likelyscareware or adware. The correct approach is toverify existing antivirus settings, run a trusted security scan, and avoid interacting with unknown pop-ups.
FromQuentin Docter - CompTIA A+ Complete Study Guide:
"Users should verify antivirus status using trusted tools before responding to alerts. Fake updates are common vectors for malware."

Comprehensive and Detailed Explanation From Exact Extract:
An "OS Not Found" error typically indicates that the computer is attempting to boot from a drive that doesn't contain a valid operating system or bootable partition. The presence of a USB drive might be confusing the boot order. Therefore, the first step a technician should take is to verify and adjust the boot sequence in the system's firmware (BIOS or UEFI). It's possible that the USB drive is being prioritized over the internal hard drive, which may cause the system to miss the OS entirely.
A: Running data recovery tools is premature before confirming boot order.
B: Repartitioning the disk would destroy existing data-this should not be done until confirmed the OS is actually missing.
D: Switching between UEFI and BIOS (legacy mode) might help in rare cases, but it is not the first step in standard OS boot issue troubleshooting.
Reference:
CompTIA A+ 220-1102 Objective 1.7: Troubleshoot common operating system problems.
Study Guide Section: Boot process and boot order configuration.