Keychain is a feature of macOS that securely stores passwords, account numbers, and other confidential information for your Mac, apps, servers, and websites1. You can use the Keychain Access app on your Mac to view and manage your keychains and the items stored in them1. Keychain can also sync your passwords and other secure information across your devices using iCloud Keychain1. Keychain can be used as a password manager in macOS to help you keep track of and protect your passwords.
References: 1: Manage passwords using keychains on Mac (https://support.apple.com/guide/mac-help/use- keychains-to-store-passwords-mchlf375f392/mac)

Bollards are the best solution to enhance building security in order to prevent vehicles from driving into the building while also maintaining easy access for customers4 References: 2. Bollards. Retrieved from https://en.wikipedia.org/wiki/Bollard

The technician should use net use command-line tool to remove and reconnect mapped drives. Net use is a command that allows users to manage network connections and resources, such as shared folders or printers.
Net use can be used to map or unmap network drives by specifying their drive letters and network paths. For example, net use Z: \server\share maps drive Z: to \server\share folder, and net use Z: /delete unmaps drive Z:.
Set is a command that displays or modifies environment variables for the current user or process. Set is not related to managing mapped drives. Mkdir is a command that creates a new directory or folder in the current or specified location. Mkdir is not related to managing mapped drives. Rename is a command that renames a file or folder in the current or specified location. Rename is not related to managing mapped drives.
References: CompTIA A+ Core 2 (220-1002) Certification Exam Objectives Version 4.0, Domain 1.6

Recovery is a Windows 10 utility that can be used to address the concern of a failed update that prevents an application from launching. Recovery allows the user to reset the PC, go back to a previous version of Windows, or use advanced startup options to troubleshoot and repair the system2. Device Manager, Administrator Tools, and Programs and Features are not Windows 10 utilities that can fix a failed update.

System is the Control Panel utility that should be used to change the Path Environment Variable. The Path Environment Variable is a system variable that specifies the directories where executable files are located. To edit the Path Environment Variable, the technician should go to System > Advanced system settings > Environment Variables and then select Path from the list of system variables and click Edit.