Consider the following partial class declarations for the Triangle and IsoscelesTriangle classes:public class Triangle{private int side1, side2, side3;public Triangle (int a, int b, int c){side1 = a;side2 = b;side3 = c;}// other code not shown}public class IsoscelesTriangle extends Triangle{public IsoscelesTriangle(int s1, int s2){< missing code >}// other code not shown}What code should replace < missing code >?super();super(s1, s2);super(s1, s1, s2);super(int s1, int s2);super(side1, side2, side3);