A nurse is initiating continuous enteral feedings for a client who has a new gastrostomy tube. Which of the following actions should the nurse take?

Measure the client's gastric residual every 12 hr.

Flush the client's tube with 30 mL of water every 4 hr.

Keep the client's head elevated at 15° during feedings.

Obtain the client's electrolyte levels every 4 hr.