Acustomer reports that recently several files cannot be accessed. the service technician decides to check the hard disk status and the file system structure. the technician asks the customer if a backup has been performed on the disk and the customer replies that the backup was done a week ago to a different logical partition on the disk. what should the technician do before performing diagnostic procedures on the disk? a. run the chkdsk utility. b. back up the user data to a removable drive. c. perform file restore from the existing backup copy at the logical partition. d. install a new hard disk as the primary disk, then make the current disk a slave.