The Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â present a uniform device- access interface to the I/O subsystem, much as system calls provide a standard interface between the application and the operating system.

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1.	The Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â present a uniform device- access interface to the I/O subsystem, much as system calls provide a standard interface between the application and the operating system.
A.	devices
B.	buses
C.	device drivers
D.	i/o systems
Answer» D. i/o systems