执行下列代码后,输出的结果为( )。
class Base
int x = 30;
void setX( ) x=1O;
class SubClass extends Base
int x=40;
void setX ( ) x=20;
int getX( ) return super. x;
public class Test
public static void main(String[ ] args)
SubClass sub=new SubClass( );
sub. setX( );
System. out. println(sub, getX( ) );
A.10
B.20
C.30
D.40