To Prevent Infection When Infusing an Intermittent "Piggyback" Line,which Intervention

To prevent infection when infusing an intermittent "piggyback" line,which intervention does the nurse implement?

A) Backpriming the secondary container from the primary line
B) Detaching and capping the secondary line after use
C) Using a new secondary container with each drug infused
D) Using sterile gloves when administering medication