During a school bus inspection, a technician finds the crossing control arm (stop arm side) fails to deploy when the stop arm is activated. What is the required action?
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A
Place a cone near the front of the bus during stops as a substitute
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B
Continue service and repair at the next scheduled maintenance
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C
Remove the bus from service — crossing arm failure is a critical safety defect
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D
Instruct the driver to escort children manually until repaired