An officer arrives at a medical call and finds a person lying on the ground. The person's eyes are closed and they do not respond when the officer asks, 'Are you okay?' However, the person groans and moves slightly when the officer performs a sternal rub. According to the AVPU scale, how should this person's level of consciousness be classified?
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A
Alert
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B
Verbal
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C
Painful
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D
Unresponsive