The cost in dollars to produce x items is given by the function C (x) = 40x + 400. a. The fixed cost is determined when zero items are produced. What is the fixed cost, in dollars, for this item? dollars b. What is the cost, in dollars, to produce 20 items? dollars c. Suppose the maximum cost allowed is $5000. What are the domain and range of the cost function, C (x)? The domain is [0, 115] and the range is [0, 5000]. The domain is [0, 115] and the range is [400, 5000]. The domain is (20, 95) and the range is [400, 5000]. The domain is [400, 5000] and the range is [0, 115]. The domain is [0, 95] and the range is (0, 5000)