According to the regulations governing Certificates of Fitness, what is the mandatory requirement for an F-04 Fireguard regarding their certificate while they are performing their duties?
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A
It must be filed securely in the event manager's office.
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B
It must be carried on their person or otherwise readily available for inspection.
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C
A photocopy must be available for inspection upon request.
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D
It must be displayed visibly on their outermost garment.