A client who has small cell carcinoma of the lung is admitted with symptoms of syndrome of inappropriate antidiuretic hormone (SIADH). As the client responds to treatment, the client's serum sodium level increases from 120 mEq/L (120 mmol/L) to 125 mEq/L (125 mmol/L). Based on this finding, which intervention should the nurse implement?Reference Range:Sodium [136 to 145 mEq/L (136 to 145 mmol/L)]

A. Assessing for increasing fluid volume overload is not indicated with a rising serum sodium level; instead, it suggests correction of hyponatremia, a common complication of SIADH.B. Withholding the next scheduled dose of treatment is not appropriate based solely on a rise in serum sodium level within the normal range.C. Increasing neurologic checks may be necessary in severe cases of hyponatremia but is not directly indicated by a rise in serum sodium within the normal range.D. Maintaining the prescribed fluid restriction is essential to prevent further dilutional hyponatremia and to help normalize the serum sodium level gradually.