A technician has just finished installing a secondary OS on a workstation. After rebooting the computer, the technician receives the following error: No OS found. The technician confirms the boot.ini file is correct. Which of the following is MOST likely causing this error? 

Answer options:

A. The computer has GRUB Legacy installed
B. Windows Startup services are not running
C. An incompatible partition is marked as active
D. An unsupported version of Windows is installed

C