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...}