Given： 10. interface Jumper { public void jump（）； } ... 20. class Animal {} ... 30. class Dog extends Animal { 31. Tail tail； 32. } ... 40. class Beagle extends Dog implements Jumper{ 41. public void jump（） {} 42. } ... 50. class Cat implements Jumper{ 51. public void jump（） {} 52. }. Which three are true？（）

A. Cat is-a Jumper
B. Cat is-a Animal
C. Dog is-a Jumper
Dog is-a Animal
E. Beagle has-a Jumper
F. Cat has-a Animal
G. Beagle has-a Tail