Accessor Method Header

Which of the following is a correct header for a method of the Example class that would return the value of the private instance variable x so that it can be used in a class other than Example?

Consider the following class definition.

public class Example
{
    private int x;
    // Constructor not shown.
}

Which of the following is a correct header for a method of the Example class that would return the value of the private instance variable x so that it can be used in a class other than Example?