Read the following sentence from a school safety policy: 'All agents must submit incident reports within 24 hours of the incident occurring, unless the incident is ongoing, in which case a preliminary report must be filed within 4 hours.' According to this policy, when must an agent submit a report for an ongoing incident?
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A
Within 4 hours of the incident starting
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B
Within 24 hours
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C
Only after the incident concludes
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D
At the end of the agent's shift