A 55-year-old woman with HFrEF (LVEF 30%) on lisinopril and spironolactone remains symptomatic (NYHA II). Which additional class is now part of foundational therapy?Ametoprolol succinateBHydralazine aloneCSGLT2 inhibitor (e.g. dapagliflozin)DDigoxinEIvabradine as first add-onCheck my answer