A 50-year-old man with long-standing hypertension presents with hyperkalaemia (K⁺ 6.3 mmol/L) discovered on routine blood work. ECG shows peaked T waves. He is taking ramipril and spironolactone. What is the most appropriate immediate treatment?AIntravenous calcium gluconateBOral sodium polystyrene sulfonate onlyCStop ramipril and spironolactone without any acute treatmentDIntravenous furosemide onlyENo treatment is needed unless K⁺ exceeds 7.0 mmol/LCheck my answer