如下有关 const 的应用,正确的是: A. const int N=3; const int arr[N] = {1,2,3}; const int *p=arr; B. const int N=3; const int arr[N] = {1,2,3}; int * p = arr; C. const int N=3; const int arr[N] = {1,2,3}; arr[0] = 6; D. const int N=3; const int arr[N] = {1,2,3}; int const* p = arr; //或者 const int *p=arr;