Which of the following BEST describes the characteristics of a differential backup solution?
A. Backs up files with the creation or modified date as the current date.
B. Backs up all files and sets the archive bit.
C. Backs up files with a date earlier than today’s date with a clear archive bit.
D. Backs up files with the archive bit set but does not clear the bit.
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Correct Answer should be D
I believe none are exactly right which means all answers are wrong, but your explanation is on point
A is not the correct answer:
A full backup resets the archive bit. This means any files changed after that will be copied by backups between that full copy and the next one.
In contrast, a differential backup copies those files that have changed since the full backup. However, it does not reset the archive bit, meaning it will copy them again the next day. An incremental backup copies changed files and resets the archive bit so that it does not copy the file unless it changes again.