If the amount of carbon dioxide (CO2) in a workplace is greater than 1,000 parts per million (ppm), it can cause drowsiness and complaints of stale air. Write an inequality to show the amount of (c) in parts per million that would represent a safe work environment.

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1 point
C > 1,000 ppm
C < 1,000 ppm
C ≤ 1,000 ppm
C ≥ 1,000 ppm