Cyrill with severe head trauma sustained in a car accident is admitted to the intensive care unit. Thirty-six hours later, the client’s urine output suddenly rises above 200 ml/hour, leading the nurse to suspect diabetes insipidus. Which laboratory findings support the nurse’s suspicion of diabetes insipidus?

A Above-normal urine and serum osmolality levels
B Below-normal urine and serum osmolality levels
C Above-normal urine osmolality level, below-normal serum osmolality level
D Below-normal urine osmolality level, above-normal serum osmolality level