Which of the following is not true of Disk Defragmenter? a) It moves sectors of data on a hard disk, so that files are stored sequentially. b) Disk Defragmenter first analyzes your hard disk to determine the level of fragmentation, and then it defragments the disk if necessary. c) Solid state drives (SSDs) must be defragmented but in a different way than hard disks. d) In Windows 7, Disk Defragmenter is scheduled to run once a week by default.