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a) Device Controller               i) Extracts information from the controller

                                               register and store it in data buffer              

b) Device Driver                     ii)  I/O scheduling

c) Interrupt handler                iii) performs data transfer

d) Kernel I/O subsystem        iv)Processing of I/O request

     a     b    c    d

A)  iii    iv    i     ii

B)  ii     i    iv     iii

C)  iv    i     ii     iii

 D) i     iii    iv    ii

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