A supervisor gives instructions: 'Before leaving, make sure the cash register is balanced, the alarm is set, and the back door is locked — in that order.' An employee balances the register, locks the back door, then sets the alarm. What mistake did the employee make?
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A
They forgot to balance the register
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B
They set the alarm before locking the door
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C
They locked the door before setting the alarm
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D
They left without balancing the register