单选题：______ present a uniform device-access interface to the I/O subs

______ present a uniform device-access interface to the I/O subsystem, while as system calls provide a standard interface between the application and the operating system.@[D](1)
A. Kernel
B. Bus
C. Operating system
D. Device drivers





A.Kernel
B.Bus
C.Operating system
D.Device drivers


答案：D