The supply function for oil is given (in dollars) by S(q), and the demand function is given (in dollars) by D(q). S(q) = q2 + 6q, D(q) =1020 - 20q - q a. Graph the supply and demand curves. Choose the correct graph. S(q) is the solid line, and D(q) is the dashed line O A. O B. O C. OD. 1000- AP 1000- AP 1000- AP 1000- 9 50 H 50 50 50 b. Find the point at which supply and demand are in equilibrium. The equilibrium point is . (Type an ordered pair.) c. Find the consumers' surplus. The consumers' surplus is $ (Type an integer or decimal rounded to the nearest hundredth as needed.) d. Find the producers' surplus. The producers' surplus is $ (Type an integer or decimal rounded to the nearest hundredth as needed.)