Question 4 (1 point) The demand function for a product is given by p(x) = ax+b, where x is the number of units of the product sold and p is the price, in dollars. The cost function is Cx)-cx² + dz . What is the marginal profit, in terms of a, b, c, d, and k, when k units of the product are sold? 2k(a-c)+b-d ak² + bk-ck²-dk 2k(a+b+c-d) k(a-c)+b-d