The hazards that could require foot protection are:
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Falling objects - Foot protection is essential to protect against injury from items that might fall from above.
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Sharps - Sharp objects can puncture or cut through footwear, so protection is needed to prevent injury.
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Hazardous liquids - Depending on the nature of the liquids, foot protection may be necessary to prevent chemical burns or other injuries.
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Low-hanging beams - While they primarily pose a risk to the head, if workers are wearing inappropriate footwear or if they trip and fall, foot protection can help reduce injuries.
Therefore, your four selected options are: Falling objects, Sharps, Hazardous liquids, and Low-hanging beams.