Which of the following is not true of Virtual Memory (VM)?
VM systems emulate other physical system by creating isolated instances of virtual environments in memory.
VM systems provide an idealised abstraction of the physical memory resources available on a system.
When there is insufficient RAM to run a program, VM systems use secondary memory to temporarily store data from RAM in order to free up RAM and run more programs
VM systems ensure running programs do not mistakenly overwrite the data and instructions of other programs in memory

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