Analyzing a 2D Array Transformation Method

Question

Consider the following Java method defined to modify a 2D array of integers where each element is evaluated and adjusted based on its neighboring elements.

public static void transform(int[][] grid) {
  for (int i = 0; i < grid.length; i++) {
    for (int j = 0; j < grid[i].length; j++) {
      if (i > 0 && grid[i-1][j] < 0) grid[i][j] *= -1;
      if (j > 0 && grid[i][j-1] < 0) grid[i][j] *= -1;
    }
  }
}

Choose the statement that best describes the modified values in the 2D array grid after executing the method.

Accepted Answer

Elements have their signs changed if either the element to their left or the element above them is negative.

Answer

All negative values in the array are changed to positive.

Answer

Elements on even rows are negated if the element above them in the previous row is negative.

Answer

Every element's sign is toggled twice if both the left and upper elements are negative.

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