Operating System (OS)
You can switch from one program to another on the desktop by clicking within the desired program's window or by clicking on its ...... button

Folder
Icon
None of above
Taskbar button

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Operating System (OS)
A critical region is

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

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