Consider the following UML diagram modelling an application that allows three types of registration for a conference. Registration, StudentRegistration and GuestRegistration represent standard, student and guest registrations respectively.

$1$

Explain the relationship between Person and Registration.

$[1]$

$2$

Write the definition $($no implementation$)$ of Registration. No pre$-$processor directives are required.

$[5]$

$3$

Write lines of code to create an instance of Registration.

$[1]$

$4$

Write the first line of the class definition $($classHead$)$ of StudentRegistration.

$[1]$

$5$

The cost of a student conference registration is half of what is returned by calculateFee$()$ in Registration. Implement the function calculateFee$()$ in StudentRegistration.

$[3]$

$6$

Explain the relationship between Registration and RegistrationList.

$[2]$

$7$ Write the first line of the class definition $($classHead$)$ of RegistrationList.

$[2]$

$8$ The function addRegistration$()$ takes a Registration$*$ as the input parametr. List all possible types of objects that can be added to a RegistrationList object.

$[2]$

$9$ Implement the function calculateTotalFee$()$ in RegistrationList, so that it adds and returns the total cost of all registrations in a RegistrationList object.