What will be the output of the following C++ code?

#include <iostream>
#include <string>
using namespace std;
int main ()
{
    string str ("Test string");
    for ( string :: iterator it = str.begin(); it != 5; ++it)
        cout << *it;
    return 0;
}

A. int* arr = new int[size]; B. int[] arr = new int[size]; C. int arr = new int[size]; D. int arr[size];

A. arr(3) B. arr[3] C. arr[2] D. arr(2)

A. 11 B. 10 C. Depends on the length of the string assigned to 'str' D. None of these

A. Concatenates two strings B. Compares two strings C. Returns the length of a null-terminated string D. Copies a string to another string