有如下程序: #include<iostreanl> using namespaee std; class AA{ public: AA( ){cout<<'1';} }; class BB:public AA{ int k; public: BB( ):k(0){eout<<'2';} BB(int n):k(n){cout<<'3';} }; int main( ){ BB,b(4),c; return 0; } 程序的输出结果是
A.1312
B.132
C.32
D.1412