Every Sunday, your company creates a full backup, and for the rest of the week it does incremental backups at the end of the day. What backups would need to be restored if your system crashed on Wednesday morning and you wanted to fully recover it?

With Incremental backups, only the data that has changed since the most recent full backup or incremental backup will be backed up. Since an incremental or full backup resets the archive bit, only Monday's changes will be backed up on Monday, Tuesday's changed files will be backed up on Tuesday, and Wednesday's changed files will be backed up on Wednesday. To retrieve all the changes that have happened since Sunday, you will need to restore all three backups.