A nurse is reviewing the laboratory report of a client and identifies a serum potassium level of 6.8 mEq/L. Which of the following medications should the nurse plan to administer?

A. Sodium polystyrene sulfonate (Kayexalate) is used to treat hyperkalemia by binding potassium in the intestines and facilitating its excretion. A potassium level of 6.8 mEq/L is critically high and requires prompt treatment. B. Sevelamer is used to manage hyperphosphatemia, not hyperkalemia. C. Lactulose is used to reduce ammonia levels, particularly in hepatic encephalopathy, not potassium. D. Darbepoetin alfa is used to treat anemia in chronic kidney disease, not electrolyte imbalances.