Operating System (OS)
To change the screen saver you can go from

Both of Above
None of These
Right click in desktop and properties
Control panel display

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Operating System (OS)
Memory management is :

not used on multiprogramming systems
critical for even the simplest operating systems
not used in modern operating system
replaced with virtual memory on current systems
None of these

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Operating System (OS)
Memory

is a sequence of instructions
is a device that performs a sequence of operations specified by instructions in memory.
None of these
is the device where information is stored
is typically characterized by interactive processing and time-slicing of the CPU

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