A client with Addison's disease becomes weak, confused, and dehydrated following the onset of an acute viral infection. The client's laboratory values include a sodium of 129 mEq/L (129 mmol/L), a glucose of 54 mg/dL (2.97 mmol/L), and a potassium of 5.3 mEq/L (5.3 mmol/L). When reporting the findings to the healthcare provider, the nurse anticipates a prescription for which intravenous medication? Reference Range: Sodium [136 to 145 mEq/L (136 to 145 mmol/L)], Glucose [74 to 106 mg/dL (4.1 to 5.9 mmol/L)], Potassium [3.5 to 5.0 mEq/L (3.5 to 5.0 mmol/L)]