A 70-year-old male with chronic heart failure with reduced ejection fraction (HFrEF, EF 32%) is clinically stable on optimal doses of Lisinopril, Bisoprolol, and Spironolactone. He remains in NYHA Class II. Which of the following medications has been shown to reduce mortality and should be added next as part of Guideline-Directed Medical Therapy (GDMT)?
- ADigoxin
- BFurosemide
- CSGLT2 inhibitor (e.g., Dapagliflozin)
- DAmlodipine