Briefly discuss how to interpret slope coefficient from the following regression model a) Y₁ =B₁ + B₂X₁ + u₁ b) InY=B₁ + B₂lnX₁ + u₂ c) InY=B₁ + B₂X₁ + 2₁ d) Y₁ =B₁ + B₂lnX₁ + u