A company-owned mobile device is displaying a high number of ads, receiving data-usage limit notifications, and experiencing slow response. After checking the device, a technician notices the device has been jailbroken. Which of the following should the technician do next?


A. Run an antivirus and enable encryption
B. Restore the defaults and reimage the corporate OS
C. Back up the files and do a system restore
D. Undo the jailbreak and enable an antivirus