Author name: Admin

114. Supervisor state is

never used
entered by programs when they enter the processor
required to perform any I/O
only allowed to the operating system
✅ The correct answer is D.

121. A critical region is

a program segment that has not been proved bug-free
a program segment that often causes unexpected system crashes
a program segment where shared resources are accessed
one which is enclosed by a pair of P and V operations on semaphores
✅ The correct answer is D.

123. Driver is

Hardware controller
Hardware and gain controller
Data controller
All of above
✅ The correct answer is A.
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