Question: Some early computers protected the operating system by placing it in a memory partition that could not be modifed by either the user job or

Some early computers protected the operating system by placing it in a memory partition that could not be modifed by either the user job or the operating system itself. Which difficulties could arise with such a scheme?

The data required by the operating system would have to be stored in unprotected memory.

Virtual memory would not be possible.

The operating system would not be able to branch to itself.

Page tables would be inaccessible.

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