A client calls, complaining that the computer he shares with family members no longer boots to Windows. Instead, when he powers it up, he gets the error message "Invalid boot device." Which of the following is most likely the problem?
a. The hard drive died.
b. System setup utility settings have been changed to make the hard drive the boot device.
c. System setup utility settings have been changed to make the optical drive the boot device.
d. System setup utility settings are set to boot first to removable media, and someone left a thumb drive in a USB port.