public class Parent {  public int addValue（ int a， int b） {     int s；     s = a+b；     return s；     }     }  class Child extends Parent {  }  Which methods can be added into class Child？（）   

• A、 int addValue（ int a， int b ）{// do something...}
• B、 public void addValue （）{// do something...}
• C、 public int addValue（ int a ）{// do something...}
• D、 public int addValue（ int a， int b ）throws MyException {//do something...}