Suppose you are building a multiple regression model with 3 independent variables, 2 of which are continuous variables, and 1 of which is an indicator variable for work-shift where there are four 6-hr work-shifts in a 24-hr day. Assuming you account for interaction between the 2 continuous independent variables in the model, how many terms would appear on the right-hand-side of your regression equation, excluding the error term?

a.6

b.8

c.7

d.9

e.5