The charge nurse observes a new nurse during the administration of two different liquid medications at once through a gastrostomy tube used for enteral feeding. The charge nurse observes the new nurse's actions. What action(s) should the charge nurse take? (Select all that apply.)

Encourage the novice to flush the tube with more water.

Instruct the novice to administer each medication separately.

Add the liquid volumes when documenting fluid intake.

Confirm that the novice determined the amount of gastric residual.

Advise the novice to use the plunger when giving medications.