假设以下代码 public class Parent { public int addValue( int a, int b) { int s; s = a+b; return s; } } class Child extends Parent { } 选项中______方法可以正确加入类Child中且父类的方法不会被覆盖。 A.int addValue( int a, int b ){// do something...} B.public void addValue (){// do something...} C.public int addValue( int a, int b )throws MyException {//do something...} D.public float addValue ( int a ,int b, float b=1.0 ){// do something...}