A customer 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.