Задача . 37389

The method changeNegs below should replace every occurrence of a negative integer in its matrix parameter with 0.

/** @param mat the matrix
* Precondition: mat is initialized with integers.
* Postcondition: All negative values in mat replaced with 0.
*/
public static void changeNegs(int[][] mat)
{
    /* code */
}

Which is correct replacement for /* code */?

I

for (int r = 0; r < mat.length; r++) 
    for (int c = 0; c < mat[r].length; c++
        if (mat[r][c] < 0)
            mat[r][c] = 0;

II

for (int c = 0; c < mat[0].length; c++)
    for (int r = 0; r < mat.length; r++)
        if (mat[r][c] < 0)
            mat[r][c] = 0;

III

for (int[] row : mat)
    for (int element : row)
        if (element < 0)
             element = 0;

(A) I only
(B) II only
(C) III only
(D) I and II only
(E) I, II, and III