You are building five identical pens adjacent to each other with a total area of 1000 square meters, as shown in the figure. What dimensions should you use to minimize the amount of fencing? Select one or more: a. x = 10, y = 20 O b. x = 14.14, y = 14.14 c. x = 15, y = 30 O d. x = 12.5, y = 16

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