Which two demonstrate an “is a” relationship？（）   

• A、 public interface Person { }  public class Employee extends Person { }
• B、 public interface Shape { }  public class Employee extends Shape { }
• C、 public interface Color { }  public class Employee extends Color { }
• D、 public class Species { }  public class Animal （private Species species；）
• E、 interface Component { }  Class Container implements Component （ Private Component[ ] children；  ）