The file type that the technician will MOST likely use when installing new software on a macOS computer is .app. This is because .app is the file extension for applications on macOS1.

Resource Monitor will help a technician identify the issue when a user reports a computer is running slow1

application that will allow a macOS user to create another virtual desktop space is Mission Control Mission Control lets you create additional desktops, called spaces, to organize the windows of your apps. You can create a space by entering Mission Control and clicking the Add button in the Spaces bar1. You can also assign apps to specific spaces and move between them easily1.

The type of backup that should be completed FIRST after installing a new backup and recovery system is a full backup. This is because a full backup is a complete backup of all data and is the foundation for all other backups. After a full backup is completed, other types of backups, such as differential and incremental backups, can be performed.

This will ensure that the antivirus software is up-to-date, and can detect any new viruses that may have been released since the last virus definition update.
The CompTIA A+ Core 2 220-1002 exam covers this topic in the following domains: 1.3 Explain the importance of security awareness and 2.2 Given a scenario, use secure data management and disaster recovery principles.