Given the following classes:a$.$ Arrange the above classes into an appropriate inheritance hierarchy. Note: do NOT add fields or methods to any of these classes.b$.$ Implement the toString$()$ method for each class each class, which prints "I am a YYY$,$ which is child of MMM$,$ which is child of PPP$".$ For example, the Tomato class should print "This is Tomato instance, which is a child of FruitItem, which is a child of FoodItem".c$.$ Implement a test class that instantiates a new instance for each class$\mathrm{.}2.$ Given the following Bike class:a$.$ Complete the setter and getter forb. Implement the equals method to check if two bikes are equals. The equals method should test the equality based on the Bike class attributes: bikeld, name, and brand.c$.$ Implement a test class that instantiates a new instance for each class.