Which blood pressure classification requires a physician referral before beginning an exercise program according to ACE guidelines?
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A
Normal (< 120/80 mmHg)
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B
Elevated (120-129 / < 80 mmHg)
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C
Stage 1 Hypertension (130-139 / 80-89 mmHg)
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D
Stage 2 Hypertension (≥ 140/90 mmHg)