One which is enclosed by a pair of P and V operations on semaphores

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

halts for predetermined time.

hands over control of address bus and data bus to the interrupting device.

Branches off to the interrupt service routine immediately.

Branches off to the interrupt service routine after completion of the current instruction.

Regular language.

Context free language.

Context sensitive language.

None-of the above.

The grammar contains useless non-terminals.

It produces more than one parse tree for some sentence.

Some production has two non-terminals side by side on the right-hand side.

None of the above.