Read the following regulation: 'Supervisors are required to document all instances of employee tardiness in the official attendance record. Three or more unexcused late arrivals within a 30-day period may result in a formal performance review.' According to this regulation, what triggers a formal performance review?
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A
Any single instance of tardiness
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B
Three or more unexcused late arrivals within 30 days
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C
Two unexcused absences in one month
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D
A supervisor's discretionary decision