A nasogastric tube that is used for medication administration should be flushed ____.

A nasogastric tube that is used for medication administration should be flushed ____.
 A) through the secondary port during administration by instilling 60100 mL (or the amount ordered) of water
  B) before the syringe empties completely by adding 60100 mL (or the amount ordered) of water to the syringe
  C) after the syringe has emptied completely by adding 60100 mL (or the amount ordered) of water to the syringe
  D) at least an hour after the medication is administered by adding 60100 mL (or the amount ordered) of water to the syringe