若有以下程序： #include ＜iostream＞ using namespace std; class Base private: int x; protected: int y; public: int z; void setx(int i) x=i; int getx () return x; ; class Inherit : private Base private: int m; public: int p; void setvalue(int a, int b, intc, int d) setx (
A．;
y=b;
z=c;
m=d;
void display()
cout＜＜getx () ＜＜","＜＜y＜＜","＜＜z＜＜","＜＜m＜＜end1;
;
int main ( )
Inherit A;
A.setvalue(1,2,3,4);
A.display ();
return 0;
A) 1,2,3,4
B．产生语法错误
C．4,3,2,1
D．2,3,4,5