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Pulley systems require the synchronized movement of all pulleys. How can pulleys escape this rule?

A Pulleys using twisted belts may move in opposing directions.
The design of pulleys prohibits the pairing of pulley and gear, and a simple reversal of belts will result in synchronized reversal of all pulleys. To violate this rule, a belt must be twisted.
B To violate this rule, pulley system belts must be reversed.
C To violate this rule, pulley systems may be used in conjunction with gears.
D This rule cannot be effectively violated.