A 54-year-old with HFrEF (EF 30%) and NYHA class II symptoms is on maximally tolerated lisinopril and metoprolol succinate. K⁺ is 5.4 mEq/L, creatinine 1.0 mg/dL. Which optimization step best reduces mortality and hospitalization now?AIncrease lisinopril above guideline-directed dosesBStart verapamil for rate controlCAdd hydralazine/isosorbide in the absence of ACEi/ARB intoleranceDAdd dapagliflozin 10 mg dailyEStart spironolactone 25 mg daily despite current potassiumCheck my answer