Suppose the demand function for cable TV service is given by QCTV = 15 - 0.25 x P CTY +0.0005 M +0.3 x P STV, where QCTV is the quantity of cable TV demanded (thousands of households), P CTy is the price of cable TV, M is income and P sty is the price of satellite TV service. We can see that: O cable TV service is an inferior good. O cable TV service and satellite TV service are complements. O cable TV service and satellite TV service are unrelated to one another. O cable TV service is a normal good