When teaching a parent about the administration of digoxin elixir to a 4-year-old child, which of the following instructions should the nurse include?

Give water to the child to rinse their mouth after administration to prevent tooth decay.

Administer the medication with a high-fiber meal.

Check the child's heart rate before administration and hold the dose if the heart rate is greater than 70 BPM.

Use a regular household spoon to measure the medication.