有如下程序：
#include ＜iostream＞
using namespace std;
class Base private:
void fun1() const cout ＜＜ "fun1";
protected:
void fun2() eonst cout ＜＜ "fun2";
public:
void tim3() const cout ＜＜ "fun3";
;
class Derived: protected Base public:
void fun4() const cout ＜＜ "fun4";
;
int main()Derived obj;
obj.fun1();// ①
obj.fun2();// ②
obj.fun3();// ③
obj.fun4();// ④
return 0;其中有语法错误的语句是( )。
A．①②③④
B．①②③
C．②③④
D．①④
