You are reviewing a workplace safety memo about a new chemical handling procedure. The memo states: 'Prior to handling Corrosive Substance X, employees must don Type B gloves and splash-proof goggles. A full-face respirator is required only when working in unventilated areas.' According to this text, when is a full-face respirator mandatory?
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A
Every time Corrosive Substance X is handled.
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B
Only when handling the substance outdoors.
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C
When working in an area without proper air circulation.
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D
After putting on Type B gloves and goggles.