有如下程序： #include＜iostream＞ using namespace std; class TestClass{ public; ～TestClass (){cout＜＜ BASE:;} }; class TestClass1:public TestClass{ public: ～TestClass 1 (){cout＜＜ DERIVED ;} }; int main(){TestClass1 x;return 0;} 执行后的输出结果是( )。
A．BASE
B．DERIVED
C．BASEDERIVED
D．DERIVEDBASE