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]