Concept:A startup disk is a bootable device that helps start a crashed computer and carry out recovery tasks.
Explanation:After a system crash, the computer may not start normally.
A startup disk provides the essential system files and tools needed to boot the computer in recovery mode.
It gives access to a system image, which is a complete snapshot of the system disk taken when the computer was stable.
This image includes the operating system, applications, and user data.
Using the startup disk, the recovery process copies the image file back onto the system disk.
This restores the entire system to the working state captured in that image.
It does not simply restore the computer to an earlier time, update application packages, or back up deleted user files.
The main purpose is to rebuild the system disk from the stored image file after a crash.
Answer:D. recover the system disk from an image file