Match List I with List II. List I: (A) Least frequently used, (B) Critical section, (C) Loosely coupled multiprocessor system, (D) Distributed operating system. List II: (I) Memory is distributed among processors, (II) Page-replacement policy in cache memory, (III) Program section that, once begun, must complete before another processor accesses the same shared resource, (IV) OS routines are distributed among available processors.

1. A(A)-(III), (B)-(II), (C)-(IV), (D)-(I)
2. B(A)-(I), (B)-(II), (C)-(III), (D)-(IV)
3. C(A)-(II), (B)-(III), (C)-(I), (D)-(IV)
4. D(A)-(II), (B)-(I), (C)-(III), (D)-(IV)

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Correct answer: C. (A)-(II), (B)-(III), (C)-(I), (D)-(IV)

Explanation

LFU is a replacement policy; a critical section must finish before another processor uses the shared resource; a loosely coupled system distributes memory among processors; a distributed OS spreads its routines across processors.