c++

6. Which of following C++ code is correct:

A.           int f()

               {

                          int  *a = new int(3);

                          return *a;

                }

B.            int *f()

                {

                         int  a[3] = {1,2,3};

                          return a;

                 }

C.            vector<int> f()

                {

                          vector<int> v(3);

                          return v;

                }

D.            void f(int *ret)

                 {

                           int a[3]={1,2,3};

                           ret = a;

                          return;

                 }

 Answer：C

其它会有野指针，导致内存泄露