Which of the following is an example of a ready-to-mix system?

The correct answer is an example of a ready-to-mix system because it refers specifically to products designed for efficient and safe preparation of medications. A ready-to-mix system typically involves pre-measured components that can be combined easily at the point of care. "Add vantage," "add a vial," and "mini bag plus" are formulations that allow healthcare professionals to easily mix medications by combining a drug within a pre-filled bag or container, ensuring that the medication is mixed just prior to administration. This system enhances patient safety and product stability, reducing the risk of contamination and dosage errors.

In contrast, the other options refer to combinations or types of solutions that are not specifically designed as ready-to-mix systems. Ringer's solution and lactated Ringer's solution are types of intravenous fluids but do not represent a mixing system. The mention of a heparin lock and Ringer's solution does not indicate a ready-to-mix functionality either, as they serve different purposes in patient care. Meanwhile, Luer-lok and slip-lok are types of syringes and connectors used in medical practices but do not imply a real-time mixing capability for medications. Thus, the combination and purpose of the components in the first option clearly illustrate a ready