Match List I with List II:

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

Choose the correct answer from the options given below:

We have to match each term with its correct meaning.

First, consider Least frequently used.

Least frequently used is a replacement policy.

It replaces the page or cache block which is used least number of times.

So,

$(A)-(II)$

Now, consider Critical Section.

Critical section is a part of a program where shared resources are accessed.

Once one process enters the critical section, another process should not access the same shared resource at the same time.

So,

$(B)-(III)$

Now, consider Loosely coupled multiprocessor system.

In a loosely coupled multiprocessor system, each processor generally has its own local memory.

So, memory is distributed among processors.

Therefore,

$(C)-(I)$

Now, consider Distributed operating system.

In a distributed operating system, operating system routines and services are distributed among available processors.

So,

$(D)-(IV)$

Final matching is:

$(A)-(II), (B)-(III), (C)-(I), (D)-(IV)$