A 70-year-old man with stage 3 chronic kidney disease (eGFR 45 mL/min/1.73 m²) and hypertension has persistent potassium 5.9 mmol/L despite stopping ACE inhibitor. ECG shows peaked T waves. What is the most appropriate immediate management?AAdminister intravenous calcium gluconateBStart a low-potassium diet onlyCGive oral sodium polystyrene sulfonate and dischargeDRepeat potassium level in 6 hours without treatmentEStart chronic loop diuretic onlyCheck my answer