Consider the following code segment, which is intended to search for a target value within an integer array arr. The segment should set the boolean variable found to true if the target is present. However, the code does not function as intended.

/** Precondition:
 * - arr is an array of integers, arr.length = n.
 * - target is the value to search for.
 * Postcondition: found == true if target is in arr[0..n-1]; false otherwise. */
boolean found = false;
int i = 0;
while (i < n && !found) {
    i++;
    if (arr[i] == target)
        found = true;
}

Which of the following proposed modifications will cause the code segment to work as intended?

I. Change the initialization int i = 0; to int i = -1;.
II. Change the while loop condition to i < n - 1 && !found.
III. In the body of the while loop, move the i++; statement to be after the if statement.