类 Parent、Child 定义如下:1.public class Parent2.{ public float aFun(float a, float b) throws3.IOException {}4.}5.public class Child extends Parent{6.7.}将以下哪种方法插入行 6 是不合法的。()
A. float aFun(float a, float b){ }
B. public int aFun(int a, int b)throws Exception{ }
C. public float aFun(float p, float q){ }
D. public int aFun(int a, int b)throws IOException{ }