A client with multiple myeloma presents to the emergency department complaining of excessive thirst and constipation. His family members report that he has been confused for the last day. Which laboratory value is most likely responsible for this client's symptoms?1. Platelet count 300,000/mm32. Serum calcium level 13.8 mg/dl3. Serum sodium level of 133 mEq/L4. Hemoglobin of 9.8 g/dl