有如下程序： #include＜iostream＞ using namespace std; class BASE{ public: ～BASE(){cout＜＜ BASE ;} }; class DERIVED:public BASE{ public: ～DERIVED(){cout＜＜ DERIVED ;} }; int main(){DERIVED x;return 0;} 执行后的输出结果是( )。
A．BASE
B．DERIVED
C．BASEDERIVED
D．DERIVEDBASE