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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.

Since Windows systems support FAT32 and NTFS "out of the box" and Linux supports a whole range of them including FAT32 and NTFS, it is highly recommended to format the partition or disk you want to share in either FAT32 or NTFS, but since FAT32 has a file size limit of 4.2 GB, if you happen to work with huge files, then it is better you use NTFS

The next step after isolating the system is to perform a system scan to remove the malware (Option C). Since ransomware is suspected, running a comprehensive malware scan can help identify and remove the malicious software. It is crucial to deal with the active threat before taking further actions.

Scheduling an antivirus scan and system update (Option A) may help, but the immediate concern is identifying and removing the ransomware.

Educating the end user (Option B) is important but should happen after the immediate threat is resolved.

Creating a system restore point (Option D) would not be useful at this point since the system is infected.

CompTIA A+ Core 2 References:

2.3 - Detect, remove, and prevent malware, including handling ransomware​.

Comprehensive and Detailed In-Depth Explanation:The best method is to create an ISO file from the DVD and store it on a file server, allowing remote installations across multiple devices.

B. Use an external USB DVD-ROM – Not practical for remote installations.

C. Copy ISO to a USB flash drive – Requires physically transferring the USB to each laptop.

D. Download an ISO from an unrelated website – Unsafe and violates security best practices.