Which among the following is correct for following code ?

Which among the following is correct for following code ?

abstract class A
{
 public Int a;
 public void disp();
};
class B:public A
{
 public: void dis()
 { 
  court<<a; 
 }
};
class C:private A
{
 public void incr()
 { 
  a++; 
 }
}
void main()
{
 B b.disp();
}