Consider the following code segment. What is printed when the code segment is executed?

int[][] matrix = { {1, 2}, {3, 4} };
for (int i = 0; i < matrix.length; i++) {
    for (int j = 0; j < matrix[i].length; j++) {
        matrix[i][j] += 1;
    }
}
System.out.println(matrix[1][1]);