Assume that an object of the following class has just been created:

            public class Unknown{
                private int x;

                public Unknown(){
                    x = 17;
                    method1();
                    method2(5);
                    method3();
                    System.out.println(x);      // Line D
                }
            
                public void method1(){
                    --x;
                    int x = this.x;
                    x++;
                    System.out.println(this.x); // Line A
                }
            
                public void method2(int x){
                    x++;
                    System.out.println(x);      // Line B
                }
            
                public void method3(){
                    --x;
                    int x = 2;
                    x++;
                    System.out.println(x);      // Line C
                }
            }
          

What output is produced by Line A when an instance of this class is created?

• 2
• 3
• 17
• 18