Comprehensive and Detailed In-Depth
The two best first steps are:
Perform a virus scan - Multiple users on a device increase the risk of malware, which can cause performance issues.
Check the startup programs - Unnecessary programs running at startup can slow down the system.
C . Back up the data - Important but not the first step for performance troubleshooting.
D . Disable the guest account - May prevent future unauthorized use but does not immediately fix the current issue.
E . Update the firmware - Firmware updates improve hardware stability but are unlikely to fix a sudden performance drop.
F . Reinstall the operating system - A last resort, as it erases data and takes significant time.
Reference:
CompTIA A+ 220-1102, Objective 2.4 - Malware and Security Threat Removal

Badge readers are devices that scan employee or visitor credentials, logging entries and exits from restricted areas. Video surveillance (B) provides a visual record but does not directly control access. Bollards (A) and fences (D) provide physical security but cannot detect or record access events.

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

The ext3 file system is a Linux native file system that meets the requirements of the question. It has the following features:
All changes are tracked. The ext3 file system uses a journaling mechanism that records all changes to the file system metadata in a special log called the journal before applying them to the actual file system. This ensures that the file system can be restored to a consistent state in case of a power failure or system crash12.
The possibility of file corruption is reduced. The journaling feature of ext3 also reduces the possibility of file corruption, as it avoids the need for a full file system check after an unclean shutdown. The file system can be quickly replayed from the journal and any inconsistencies can be fixed12.
Data recovery is easy. The ext3 file system supports undeletion of files using tools such as ext3grep or extundelete, which can scan the file system for deleted inodes and attempt to recover the data blocks associated with them34.
Reference:
1: Introduction to Linux File System [Structure and Types] - MiniTool1 2: 7 Ways to Determine the File System Type in Linux (Ext2, Ext3 or Ext4) - Tecmint3 3: How to Recover Deleted Files in Linux with ext3grep 4: How to Recover Deleted Files from ext3 Partitions

4. Chrome OS. Retrieved from https://en.wikipedia.org/wiki/Chrome_OS 5. What is Chrome OS? Retrieved from https://www.google.com/chromebook/chrome-os/ A netbook with a web-based, proprietary operating system is most likely running Chrome OS. Chrome OS is a web-based operating system developed by Google that is designed to work with web applications and cloud storage. It is optimized for netbooks and other low-power devices and is designed to be fast, secure, and easy to use.