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Unit 5 · System Software and Operating System

Match List I with List II.
List I: (A) Least frequently used (B) Critical section (C) Loosely coupled multiprocessor system (D) Distributed operating system organization
List II: (I) Memory is distributed among the processors (II) Page replacement policy in cache memory (III) Program section that one process must completely execute before another process can access the same shared resource (IV) O/S routines are distributed among the available processors
Choose the correct answer from the options given below.

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

Explanation

Least frequently used (LFU) is a cache/page-replacement policy that discards the page accessed the fewest number of times, matching (II). A critical section is, by definition, the part of a process's code that accesses a shared resource and that only one process may execute at a time, matching (III). A loosely coupled multiprocessor system is one where each processor has its own private local memory rather than one shared memory module, matching (I). A distributed operating system spreads its OS routines/services across the available processors instead of centralizing them, matching (IV). This gives A-II, B-III, C-I, D-IV, option (iii).

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