$4.$ You are creating a Java program for a ride$-$sharing service called Uber, where users can request rides and drivers can accept them. Each ride has a unique ID$,$ the pickup location, the drop$-$off location, the distance of the ride $($in miles$),$ the duration of the ride $($in minutes$),$ the cost of the ride, and the driver's name.

Your task is to create a Java class called "RideRequest" that can represent a single ride request. The class should have the following:

a$.$ Private instance variables to store the ride ID$,$ pickup location, drop$-$off location, distance, duration, cost, and driver's name.

b$.$ A constructor that takes the ride ID$,$ pickup location, and drop$-$off location as parameters and initializes the instance variables $($distance$,$ duration, cost, and driver's name should be set to $0$ or an empty string$).$

c$.$ Getter and setter methods for all the instance variables.

d$.$ A method called "calculateRideCost$()"$ that calculates the cost of the ride based on the distance and duration $($e$.$g$.,$ $$2$ per mile $+$ $$0\mathrm{.}20$ per minute$).$

e$.$ A method called "assignDriver$($String driverName$)"$ that sets the driver's name for the ride.