The required correct header for the given method of the class is; public int getX()
From the complete question online, it is clear that the value is to be accessed in other classes.
From the above, it means that we will make use of the public access modifier which would allow the instance variable be accessed from other classes.
Finally, we know that the return type must be the variable type of x which is defined as an integer. Thus, the constructor becomes public x.
Lastly, we include the constructor name; getX().
Hence, the correct header is: public int getX()
Read more about Class Programs at; https://brainly.com/question/24833629