Potassium-sparing diuretics have which of the following effects on potassium? 1. Antagonize the effect of angiotensin II on potassium. 2. Agonize the effect of aldosterone on potassium. 3. Antagonize the effect of ADH on potassium. 4. Agonize the effect of renin on potassium. 5. Antagonize the effect of aldosterone on potassium.