When Preparing to Piggyback an Antibiotic to a Primary I

When preparing to piggyback an antibiotic to a primary I.V. infusion, a nurse could hang the medication in which of the following ways? SELECT ALL THAT APPLY.

A) Hanging the antibiotic solution higher than the primary I.V.
B) Hanging the antibiotic solution lower than the primary I.V.
C) Hanging the antibiotic solution level to the primary I.V. and delivering simultaneously
D) Disconnecting the main solution and plugging in the secondary administration set