CompTIA A+ 220-902 Question G-23

A technician is fixing a very slow computer. Antivirus and Malware programs have been run, and some detections have been removed. After running Disk Cleanup, the system still seems to be slow, especially with multiple programs running. Which of the following should the technician do NEXT?

B. Manually erase all cookies
C. Go back to the latest restore point
D. Run defrag