Security exam questions

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The dangers associated with belt drives arise at the belt joints and where the belt enters the pulleys; protective mesh with a metal framework is usually used for protection. Among the protective measures for the following belt drive systems, which one does not meet safety requirements? ( ) 　　A. When the center distance between the belt pulleys is over 3 meters, a protective mesh with a metal frame should be used for protection. B. When the belt width is over 15 cm, a protective mesh with a metal frame should be used for protection. C. When the belt drive mechanism is below 2 meters above the ground and the belt’s rotational speed is below 9 m/min, no protection is required. D. When the belt drive mechanism is above 2 meters above the ground and the center distance between the belt pulleys is under 3 meters, no protection is required