若有以下程序: include <iostream> using namespace std; class Base { public: void who(){cout<<' Base'<<end1:} }; class Derived1: public Base { public: void who(){ cout<<'Derived'<<end1;} }; int main() { Base *p; Derived1 obj1; p=&obj1; p->who(); return 0; } 则该程序运行后的输出结果是【 】。