Operating System (OS)
Daisy chain is a device for

connecting a number of controllers to a device
interconnecting a number of devices to a number of controllers
None of these
connecting a number of devices to a controller
All of these

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Operating System (OS)
A critical region is

a program segment that often causes unexpected system crashes
a program segment that has not been proved bug-free
one which is enclosed by a pair of P and V operations on semaphores
a program segment where shared resources are accessed
none is the above

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Operating System (OS)
System maintenance:

is usually not necessary
is necessary on all systems, regardless of how good
always requires several programs
is not required if the system is well written
None of these

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