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Q12). Consider the following statments.

 $S1$ : A thread running in critical section may get context switched .

$S2$ : Hardware access to devices is usually unavailable in user mode.

$S3$ : Modification to page tables are only possible in kernel mode,

Which of the above statement are correct?

a). $S1,S2$

b). $S2,S3$

c). $S1,S3$

d). $S1,S2,S3$

Is the statement S1 correct?? ans given is D  but according to me it should be B 

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