When Administering Medication to a Patient Whose Dose Has a Bar

When administering medication to a patient whose dose has a bar code on the medication wrapper that must be scanned by the computer,the nurse knows that which protocols must be followed? (Select all that apply.)

A) Scan the bar code with the computer; there is no need to do anything else.
B) Check the drug before removing it from the unit-dose cart.
C) Check the dose before preparing or measuring the medication.
D) Check the drug just before you open it and give it to the patient.
E) Scan the empty wrapper of a previously given drug since it's the same drug.