Çàäà÷à . 37466

This question is based on the Point class below:

public class Point
{
  /** The coordinates. */
  private int x;
  private int y;
  public Point (int xValue, int yValue) 
  { 
    x = xValue;
    y = yValue;
  }

  /** @return the x-coordinate of this point */
  public int getx() 
  { return x; }

  /** @return the y-coordinate of this point */
  public int gety()
  { return y; }

  /** Set x and y to new_x and new_y. */
  public void setPoint(int new_x, int new_y)
  {
    x = new_x;
    y = new_y;
  }

  //Other methods are not shown.
}

The method changeNegs below takes a matrix of Point objects as parameter and replaces every Point that has as least one negative coordinate with the Point (0,0).

/** @param pointMat the matrix of points
* Precondition: pointMat is initialized with Point objects.
* Postcondition: Every point with at least one negative coordinate
* has been changed to have both coordinates
* equal to zero.
*/
public static void changeNegs (Point [][] pointMat)
{
  /* code */
}

Which is a correct replacement for /* code */?
I

for (int r = 0; r < pointMat.Length; r++)
  for (int c = 0; c < pointMat[r].Length; c++)
    if (pointMat[r][c].getx() < 0
        || pointMat[r][c].gety() < 0)
      pointMat[r][c].setPoint(0, 0);

II

for (int c = 0; c < pointMat[0].Length; c++)
  for (int r = 0; r < pointMat.Length; r++)
    if (pointMat[r][c].getx() < 0
        || pointMat[r][c].gety() < 0)
      pointMat[r][c].setPoint(0, 0);

III

foreach (Point[] row in pointMat)
  foreach (Point p in row)
    if (p.getx() < 0 || p.gety() < 0)
      p.setPoint(0, 0);

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