对于下列代码:public class Parent{public int addValue(int a,int b){int s;s=a+b;return s;}}class Child extends Parent{ }下列哪个方法不可以加入类Child?
A. public int addValue(int a,int b,int c) {return a+b+c;}
B. int addValue(int a,int b) {return a+b;}
C. public int addValue(int a) {return a+1;}
D. public int addValue(int a,int b) {return a+b+1;}