A city ordinance reads: 'Noise levels in residential zones must not exceed 65 decibels between 7:00 AM and 10:00 PM, and must not exceed 50 decibels at all other hours.' A contractor operates equipment at 60 decibels at 11:00 PM. This is:
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A
Permissible because 60 decibels is below the daytime limit
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B
A violation because 60 decibels exceeds the nighttime limit of 50 decibels
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C
Permissible because contractors are exempt
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D
A violation only if a neighbor complains