运行下列程序时的输出结果是()。#includeusing namespace std;class A{public:A( ) { cout<<"A";}};class B:virtualpublic A{ // A行public: B( ) { cout<<"B";}};class C:private A{ // B行public: C( ) { cout<<"C";}};class D:protected B,C{ // C行public: D( ) { cout<<"D";}};int main(void ){ D t; system("pause"); return 0;}

ABACD
B. AABCD
C. ABCD
D. AABACD