A 68-year-old man with CKD stage 4 (eGFR 20 mL/min/1.73 m²) presents with serum potassium 6.8 mmol/L, peaked T waves on ECG and no symptoms. According to emergency management principles, what is the most appropriate immediate intervention?AIntravenous calcium gluconateBOral sodium polystyrene sulfonateCIntravenous furosemide onlyDAdvise low-potassium diet and repeat potassium tomorrowEStart oral sodium bicarbonate and recheck in a weekCheck my answer