A nurse is caring for a client who is postoperative and has a history Addison's disease. For which of the following manifestations should the nurse monitor?

A. Hypotension: Loss of cortisol and aldosterone in Addison’s disease leads to decreased vascular tone and sodium/water loss, making hypotension an important postoperative concern. B. Bradycardia: Bradycardia is not a hallmark of Addison’s disease; compensatory tachycardia is more likely with hypovolemia. C. Hypernatremia: Addison’s disease causes sodium loss (hyponatremia) rather than sodium excess. D. Hypokalemia: Aldosterone deficiency in Addison’s leads to potassium retention and hyperkalemia, not hypokalemia.