QUESTION $3\mathrm{.}2(25$ MARKS$)$

$3\mathrm{.}2.$ Use the case study in Question $3\mathrm{.}1$

Implement three classes that inherit from the "Employee" abstract class:

a$).$ FullTimeEmployee: This class represents a full$-$time employee and should include the following additional properties:

double MonthlySalary

Implement the CalculateSalary$()$ method to return the monthly salary.

b$).$ PartTimeEmployee: This class represents a part$-$time employee and should include the following additional properties:

double HourlyRate

int HoursWorked

Implement the CalculateSalary$()$ method to return the salary based on the hours worked and hourly rate.

c$).$ ContractualEmployee: This class represents a contractual employee and should include the following additional properties:

double ContractAmount

Implement the CalculateSalary$()$ method to return the contract amount.

d$).$ In the main program, create instances of each type of employee $($full$-$time, part$-$time, and contractual$),$ populate their data, and demonstrate the functionality of your implemented methods.

Your solution should demonstrate proper usage of structures, interfaces, abstract classes, and inheritance principles in C#$.$ Ensure that user input is handled appropriately and that meaningful output is provided.

$(25$ MARKS$)$

NOTE: code in C#