The correct matching of the following pairs is

(A) Disk check              (1) Roundrobin
(B) Batch processing        (2) Scan
(C) Time sharing            (3) LIFO
(D) Stack operation         (4) FIFO

(A)

A B C D
 3 4 2 1

(B)

A B C D
4 3 2 1

(C)

A B C D
3 4 1 2

(D)

A B C D
2 4 1 3

Answer: (D)

Explanation: Option (D) is correct:
A: Disk check- (2) Various scan algorithms are used for disc checking like FCFS, SSTF, SCAN, C-SCAN, LOOK, C-LOOK etc.
B: Batch Processing- In batch processing processes are strictly executed in FIFO order.
C: Time sharing- In Round Robin scheduling algorithm, the processes perform CPU execution in time sharing manner as there is a fixed time quanta associated with each process for execution.
D: Stack operation- stack operates in last in first out manner.

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