单选题

有以下类定义 #includeusing namespace stdcl...

Question

有以下类定义

#includeusing namespace stdclass A{public:void setA(int)void showA()private:int a}class B{public:void setB(int)void showB()private:int b}class C : protected A, private B{public:void setC(int, int, int)void showC()private:int c}

C类的私有数据成员是（ ）

A. a,b,c

B. b,c

C. c

D. a,c