The total daily cost (in dollars) of manufacturing scented candles is given by the function c(b) = 250 + 3b, where b is the number of candles manufactured. which function represents the average manufacturing cost, a, in terms of b? a. a(b)= b/250 + 3b b. a(b)=250 + 3b/b c. a(b)=(250 + 3b) x (b) d. a(b)=250 + 4b