Operating System (OS)
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
none is the above

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Operating System (OS)
File record length

None of these
should be chosen to match the data characteristics
depends upon the size of the file
should always be fixed
Should always be variable

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Operating System (OS)
Assembler language

is quite different from the SCL interpreter
is a mnemonic form of machine language
requires fixed-format commands
None of these
is usually the primary user interface

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