Question: When considering a system that is isolated from the universe and observed without disturbing it , under what circumstances is its total energy conserved, that

When considering a "system" that is isolated from the universe and observed without disturbing it, under what circumstances is its total energy conserved, that is, always the same?
Always, no exceptions
Never, it can gain or lose energy by internal processes
Only if it is at rest as we see it
When considering a "system" that is isolated from

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