Let binary variables G1, G2 and G3 represent the green LED states: G1 = 1 when the first green LED is on, G1 = 0 when the first green LED is off, etc. Draw a truth table for function Y(G1,G2, G3), such that Y = 1 whenever two or fewer green LEDs are on, and Y = 0 when this is not the case. Write an Boolean algebraic expression for Y in terms of G1, G2 and G3.