The model: Y = ₀ + ₁X₁ + ₂Log(X₂) + ₃X₃² + ₄X₄ + noise where X₄ = 0 or 1

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a

Can be estimated by standard regression because each term is simply a coefficient times a variable, like a linear function.

b

Can be estimated by standard regression, except for the Log(X₂) term.

c

Can be estimated by standard regression except for the binary (0-1) term, X₄.

d

none of the above.