问题：

[多选]

public class Team extends java.util.LinkedList { 
public void addPlayer（Player p） { 
add（p）； 
} 
public void compete（Team opponent） { /* more code here */ } 
} 
class Player { /* more code here */ } 
Which two are true？（）

A .  This code will compile.
B .  This code demonstrates proper design of an is-a relationship.
C .  This code demonstrates proper design of a has-a relationship.
D .  A Java programmer using the Team class could remove Player objects from a Team object.