public class Polygon { /* Attributes */ private Point[] vertices = new Point[size]; // list of vertices in order /* Constructors */ public Polygono /* Getters and Setters */ public Point[getVertices() { return vertices; 3 public void setVertices(Point[] vertices) { this.vertices = vertices; } /* Other methods */ public double area { System.out.println("I won't compute it at this level. Please run it at the subclass level"); return -1; } public class Rectangle extends Polygon { /* Constructors */ public Rectangle() { super(); } public double area() { Point[] vertices = getVertices(); double side1 = Math.sqrt(Math.pow(vertices[0].getX(-vertices[1].getX(), 2) + Math.pow(vertices[0].getYO-vertices[1].getYO, 2)); double side2 = Math.sqrt(Math.pow(vertices[2].getX(-vertices[1].getX(), 2) + Math.pow(vertices[2].getY(-vertices[1].getYO, 2)); return side1 * side2; } What do you observe in this code among the following? Encapsulation Overloading Overriding For each property you observed, explain where in the code you observed it and what it means