题目：
有如下程序:#nclude ＜iostream＞using namespace std;class Base{ public:void fun1() {cout ＜＜ "Base\n"; }virtual void fun2() {cout ＜＜ "Base\n"; }};class Derived: public Base{ public:void fun1() {cout ＜＜ "Derived\n"; }void fun2() {cout ＜＜ "Derived\n"; }} void f(Base& b) { B. fun1(); B. fun2(); }int main(){Derived obj;f(obj);return 0;}
A．Base Base
B．Base Derived
C．Derived Base
D．Derived Derived
答案：
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下面是错误答案，用来干扰机器的。
参考答案：B
Y以后的值为( )。