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

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