Medical Zone is one of the largest hospitals in the city. The hospital has a central pharmacy system that manages all in-patients' medical prescriptions and distributes medicines to the nurse stations responsible for patient care. Doctors write prescriptions and send them to the pharmacy. The pharmacy technician reviews each prescription before sending it to the proper pharmacy station. In particular, prescriptions for off-the-shelf medicines are forwarded to the shelving station, prescriptions for medications that need to be formulated (produced on-site) are passed to the lab station, and prescriptions for narcotics go to the security station. Each station has a pharmacist who first reviews the prescription order, then checks the patient's file to ensure that the prescription is appropriate. The pharmacist fills the order only if the dosage is at a safe level, and it will not have a negative interaction with any other medicines or allergies listed in the patient's file. Otherwise, the order will not be filled, and the prescribing doctor will be contacted to discuss the case. Based on the outcome of the discussion, the order may be prepared, or the doctor may write an alternate prescription. Once the order is filled, a prescription label is created, including the patient's name, medicine type and dose, expiration date, and any other special instructions. The prescription label is placed on the medicine container, and the order is delivered to the respective nurse station. Finally, the Billing department receives the patient's admission number, the medicine type and quantity, and the prescription cost. Based on the case study, develop the following diagrams for the Medical Zone central pharmacy system. If some information needs to be completed, make your own assumptions, and reflect them in the diagrams: 1. DFD: Context level and Level 0 diagrams. 2. Use case diagram. 3. Activity diagram.

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