If X2 is a binary predictor in Y = 0 + 1X1 + 2X2, then which statement is most nearly correct? (a)X2 = 0 would represent the case when the X2 condition is not present (b)X2 would be a significant predictor only if 1 is significan (c)There could be up to four different categories for the X2 predictor (d)X2 will equal 1 unit if X2 is significant..