A medical centre uses objects of the class Appointment to record treatments given and medication prescribed during each doctor's appointment. Some of the attributes required in the class are listed in the table. Attribute | Data type | Description DateSeen | DATE | date of treatment Treatments | STRING | treatments given Medications | STRING | medications prescribed Patients are identified by a unique 8-digit number, beginning with the patient's year of birth, for example, 20108989. Doctors are identified by their name, for example, A N Other. [Figure with partial class diagram for 'Appointment']

1. (a)Complete the class diagram for Appointment, to include: • attribute and data type for the identification of the patient • attribute and data type for the identification of the doctor • methods to assign date seen, treatments given and medications prescribed • method to return the date seen and the attributes for the patient and the doctor.[5]
2. (b)(i)Identify the object-oriented programming (OOP) feature whose function includes restricting external access to the data.[1]
3. (b)(ii)Describe what is meant by the OOP feature inheritance.[2]

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