Match List I with List II. List I: (a) Micro-operation, (b) Microprogrammed control unit, (c) Interrupts, (d) Microinstruction. List II: (i) Specify micro-operations, (ii) Improve CPU utilization, (iii) Control memory, (iv) Elementary operation performed on data stored in registers.

1. A(a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)
2. B(a)-(iv), (b)-(iii), (c)-(i), (d)-(ii)
3. C(a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)
4. D(a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)

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Correct answer: A. (a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)

Explanation

A micro-operation is an elementary register operation; a microprogrammed control unit uses control memory; interrupts improve CPU utilization; a microinstruction specifies micro-operations.