A nurse is planning care for a client who is receiving continuous enteral tube feedings through an open system. Which of the following interventions should the nurse include in the plan of care?

A. Flush the tubing with 30 mL of water every 4 hr. Flushing the tube regularly helps maintain patency, prevent clogging, and ensure that the feeding is delivered effectively. This is a standard practice in managing enteral feeding systems. B. Check for gastric residual every 12 hr. Gastric residuals should typically be checked every 4 to 6 hours, or per facility protocol, especially in clients at risk for aspiration. Waiting 12 hours is too long and may delay identifying feeding intolerance. C. Place enough formula in the container to last 18 hr. Open systems should have fresh formula added every 4 hours to reduce the risk of bacterial contamination. Leaving formula in the feeding bag for 18 hours exceeds safety guidelines and increases infection risk. D. Maintain bed elevation at 20°. The head of the bed should be elevated to at least 30 to 45 degrees to reduce the risk of aspiration. A 20° elevation is insufficient and does not provide adequate protection during feeding.