Restaurants are different in rating R and price P. Consumers usually prefer higher ratings or lower prices. Restaurant A has (R, P) = (4, 2). Restaurant B has (R, P) = (4, 4). Restaurant C has (R, P) = (2, 2). Restaurant D has (R, P) = (2, 4). 

(a) Show the price-rating coordinates of the four restaurants on a graph. 

(b) Draw indifference curves satisfying a preference relation: A  B  C  D ( means strictly prefer,  means indifferent).