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]