Duvida na resposta many modifiers?

Given: 

 1. class TestFoo {
 2.   int x;
 3.   String y;
 4.   int getX() { return x; }
 5.   String getY() { return y; }
 6.   void setX(int x) {
 7.     int z = 7;
 8.     this.x = x;
 9.   }
10. }

How many modifiers must you add to encapsulate this class?

A 2 
B 3 
C 4 
D 5