11. Which is the first program run on a computer when the computer boots up? A. System software B. Operating system C. System operations D. None 12. Which is built directly on the hardware? A. Computer Environment B. Application Software C. Operating System D. Database System 13. Which runs on computer hardware and serve as platform for other software to run on? A. Operating System B. Application Software C. System Software D. All 14. Which is the layer of a computer system between the hardware and the user program? A. Operating environment B. Operating system C. System environment D. None 15. The primary purpose of an operating system is: A. To make the most efficient use of computer hardware. B. To allow people to use the computer. C. To keep systems programmers employed. D. To provide a easy-to-use user interface