Which two demonstrate&#819

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；  ）