Question: What does it mean when we say that digital storage is non - volatile? Old versions of data are kept by the operating system and

What does it mean when we say that digital storage is non-
volatile?
Old versions of data are kept by the operating system and can always be recovered.
Data are not lost when power is lost.
Data are lost when power is lost.
Data, once written, cannot be changed.
What does it mean when we say that digital

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