What is the scope of odometer defined on line $2$

$1$ public class SimpleCar $\{$

$2$ private int odometer;

$3$ public void driveForward$($int miles$)\{$

$4$ odometer $=$ odometer $+$ miles;

$5\}$

$6$ public void changeOdometer$($int miles$)\{$

$7$ int odometer;

$8$ odometer $=$ miles;

$9\}$

$10\}$

Group of answer choices

method changeOdometer$()$

all of class SimpleCar

odometer is not defined

method driveForward$()$