A 64-year-old woman with heart failure with reduced ejection fraction (HFrEF) and a resting heart rate of 84 beats per minute, who is on maximized beta-blocker therapy, asks about ivabradine. Which criterion must be met for its use?ASinus rhythm with heart rate ≥70 bpm despite maximized beta-blockerBAtrial fibrillation regardless of heart rateCHeart rate <60 bpmDUse instead of beta-blockerEUse with nondihydropyridine calcium channel blockerCheck my answer