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Explanation/Reference: Explanation: Archive bit 1 = On (the archive bit is set). Archive bit 0 = Off (the archive bit is NOT set). A full backup backs up all files regardless of whether the archive bit is 1 or 0 and sets the archive bit to 0. When the archive bit is set to ON, it indicates a file that has changed and needs to be backed up. Differential backups back up all files that have changed since the last full backup - all files that have their archive bit value set to 1. Differential backups do not change the archive bit value when they backup a file; they leave the archive bit value set to 1. Incorrect Answers: B: Backs up data labeled with archive bit 1 and changes the data label to archive bit 0. - This is the behavior of an incremental backup, not a differential backup. C: Backs up data labeled with archive bit 0 and leaves the data labeled as archive bit 0. - If the archive bit is set to 0 (Off), it will only be backed up with a Full backup. Differential and incremental backups will not back up the file. D: Backs up data labeled with archive bit 0 and changes the data label to archive bit 1. - If the archive bit is set to 0 (Off), it will only be backed up with a Full backup. Differential and incremental backups will not back up the file. References: https://en.wikipedia.org/wiki/Archive_bit