The nurse is preparing to mix two medications from two different multidose vials, A and B. In which order should these actions be implemented when drawing the solutions from the vials? (Arrange from first on top to last on the bottom.)

A. Inject the volume of air to be aspirated from each vial: Injecting air equal to the volume to be withdrawn helps maintain pressure inside the vial and facilitates accurate aspiration of the medication. B. Verify the drug and dose with the label on the vial: Confirming the correct medication and dose is the first step to ensure patient safety and prevent medication errors before handling any vials. C. Aspirate the desired volume from vial B: After vial A is drawn, aspirate the second medication to complete the mixture. Drawing in this order reduces the risk of cross-contamination between vials. D. Aspirate the desired volume from vial A: When mixing medications, draw from the vial containing the first drug (usually the one that will not interact or is to be administered first) to avoid contamination between vials.