Suppose that ≺D,+,⋅≻ is a well-ordered integral domain. Then the least positive element in D is the unity e∈D, since if a∈Dp such that e>a, then e−a∈Dp⟹a(e−a)∈Dp⟹a−a2∈Dp. I.

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A: We use substitution method

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A: option 3 is correct, see the solution, please thumbs up, if your doubt is cleared.

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