Activity Monitor is an app that shows information about the processes running on your Mac, including how much CPU, memory, disk, network, and energy they use. You can use Activity Monitor to identify and quit processes that are slowing down your Mac or causing other issues. You can also view graphs and statistics of your Mac's performance and activity. To open Activity Monitor, go to Applications > Utilities, or use Spotlight to search for it. You can then select a process and click the Info button to see more details, or click the X button to quit the process. You can also sort the processes by different columns, such as CPU, Memory, or Energy, to see which ones are using the most resources. You can also choose different tabs to see different types of processes, such as CPU, Memory, Disk, Network, or Cache. Activity Monitor is a useful tool for troubleshooting performance issues on your Mac and optimizing its efficiency. References: Use Activity Monitor on your Mac, How to see all the running programs on your Mac, How to See Which Program Is Using All Your CPU on Mac, How to track and kill processes on your Mac

To delete a user on a Mac, you need to follow these steps12:
* Navigate to System Settings - Users & Groups. This is where you can manage the users and groups on your Mac. You may need to scroll down to see all the options.
* Click the lock icon at the bottom left of the window and enter your administrator password to make changes.
* Click the (i) button next to the user you would like to delete on Mac. This will show you more information about the user, such as their name, picture, password, and permissions.
* Click Delete User or Delete Group. This will prompt you to confirm your action and choose what to do with the user's home folder.
* Select Delete Account. This will remove the user and their home folder from your Mac, freeing up storage space. Alternatively, you can choose to save the home folder as a disk image or leave it as it is, in case you want to restore the user later.
* Click Delete User or Delete Group again to finalize the deletion.
References: Delete a user or group on Mac - Apple Support, Here's our guide on how to delete a user on Mac - MacPaw

A warning icon might appear in the Security Recommendation window for a password in Passwords settings if the password meets any of the following criteria:
* The password is reused on another website. This means that the same password is used for more than one saved password across different domains. This can make the accounts vulnerable to credential-stuffing attacks, where attackers try the same credentials on other services to compromise additional accounts1.
* The password appeared in a data leak. This means that the password has been compromised by a data breach and exposed online. This can allow attackers to access the accounts that use the leaked password or try to guess other passwords based on the leaked one1.
* It's a commonly used password or it's easily guessed. This means that the password is weak and may be easily cracked by an attacker. This can happen if the password uses words found in a dictionary, common character substitutions, patterns found on a keyboard, or repeated sequences. These patterns are often used to create passwords that satisfy minimum password requirements for services, but are also commonly used by attackers attempting to obtain a password using brute force1. References: 1:
Password security recommendations - Apple Support

If"Install macOS updates"is off inSystem Settings > General > Software Update > Automatic Updates, the Mac won't upgrade automatically.
* Option A: Volume owner isn't a macOS concept here.
* Option B: Secure token isn't for updates.
* Option D: Download-only doesn't stop install.
* Option C: Correct-disables auto-install.References: Apple Support - "Update macOS" (support.apple.
com/HT201541).