A corporation manufactures two variants of the same product: Deluxe (D) and Classic (C). The company has a limited amount of three ingredients used to manufacture these products: 4800 ounces of ingredient I; 9600 ounces of ingredient II and 2000 ounces of ingredient III. A box of Deluxe requires 2 ounces of ingredient I, 6 ounces of ingredient II and 1 ounce of ingredient III; while a box of Classic requires 3 ounces of ingredient I, 8 ounces of ingredient II and 2 ounces of ingredient III. Profits for a box of Deluxe are $0.40; and for a box of Classic $0.50. If the company manufactures 800 boxes of Deluxe and 600 boxes of Classic, which resource has "slack" (i.e., which resource is not fully used)? Ingredient III (only) Ingredient I and ingredient III Ingredient I and ingredient II Ingredient II (only) Ingredient I (only)