A public method named addRating that takes a [reference to a] an object of type Rating as a parameter (The type of the input is Rating) and returns void o This method will be called when a Reviewer rates this Song. All added Ratings will be stored in a Linked List as an instance variable o This method will append new ratings to the end of the linked list A public method named getRatings that takes no parameters and returns a LinkedListNode of Ratings o This method returns the head of a Linked List containing all Ratings that have been added to this Song o The returned Linked List must return the Ratings in the order in which they were added. For example, the first Rating that was added must be the first value in the list o If no ratings have been added, this method will return null A public method named setRatings that takes a Linked ListNode of Ratings and returns void o This is a setter that replaces the stored linked list of ratings (The instance variable) with the one provided as a parameter