What is the maximum allowable opening size in a climber's rungs or steps to prevent foot entrapment for school-age children?
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A
Less than 3.5 inches or greater than 9 inches
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B
Less than 2 inches or greater than 6 inches
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C
Less than 4 inches or greater than 10 inches
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D
Less than 1 inch or greater than 5 inches