单项选择题

有如下程序: #include <iostream.h> using namespace std; class Base { protected: int i: public: int j; }; class Derived: public Base { int m: public: int n; } int main() { Derived d: d.i=0; //[1] d.J=0; //[2] d.m=0; //[3] d.n=0: //[4] return 0; } 其中主函数中有两个赋值语句有错,这两个错误的赋值语句是

A.[1]和[2]
B.[1]和[3]
C.[2]和[3]
D.[2]和[4]