有如下程序#includeusing namespace std;classA{public:virtual Void funcl(){cout<< “A1”;}void fune2(){cout<< “A2”;}};classB、publicA{public:void func1(){cout<< “B1”;}void func2(){cout<< “B2”;}};Int main(){A*p=newB;p->funcl();p->func2();retum0;}运行程序，屏幕上将显示输出______。A．B1B2