A. Use salt tablets after strenuous exercise is incorrect. Clients with hypernatremia should avoid excessive sodium intake, including salt tablets, as this can worsen the condition. B. Drink plenty of water whenever thirsty is incorrect. Thirst is a late sign of dehydration, and clients with hypernatremia should be encouraged to drink water regularly, even before feeling thirsty, to maintain proper hydration and correct sodium imbalances. C. Monitor daily urine output volume is incorrect. While monitoring fluid balance is important, urine output alone does not directly address sodium intake or management, making reviewing food labels for sodium content a more critical intervention. D. Review food labels for sodium content is correct. Clients with hypernatremia should limit sodium intake by carefully reading food labels and avoiding processed, canned, and fast foods that are high in sodium.