Computer Basic Information
The essential difference between an operating system like Linux and one like Windows is that

None of these
Linux is proprietary, whereas Windows is not.
any programmer can modify Linux code, which is not permitted with Windows.
there are multiple versions of Linux, but only one version of Windows.
Windows can run with an Intel processor, whereas Linux cannot.

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Computer Basic Information
Bit map terminal

requires considerable amount of video RAM
support displays containing multiple windows
requires tremendous amount of copying and hence low performance
All of these
None of these

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