Meow Cat chow has a demand of 4000 units per year. When producing the product, the factory's setup cost is $20, and holding cost is $4 per unit per year. The cost-minimizing solution for this product is to order:

(A) all 4000 units at one time.
(B) 200 units per order.
(C) every 20 days.
(D) 10 times per year.
(E) none of the above

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