1. class BaseClass { 
2. private float x = 1.of； 
3. protected float getVar（） { return x； } 
4. } 
5. class SubClass extends BaseClass { 
6. private float x = 2.Of； 
7. // insert code here 8. }  
Which two are valid examples of method overriding when inserted at line 7？（） 

A. public class X {  }     public class Y extends X { }
B. public interface Shape { }     public interface Rectangle extends Shape{ }
C. public interface Color { }     public class Shape { private Color color； }
D. public interface Species { }     public class Animal { private Species species； }
E. public class Person { }    public class Employee {      public Employee（Person person） { }
F. interface Component { }     class Container implements Component {   private Component[] children； }

A. equal
B. not equal
C. exception
D. Compilation fails.

A. true
B. false
C. Compilation fails.
D. An exception is thrown at runtime.