Consider the following method definition:
 
int update( int userIn )
{
   userIn++;
   return userIn;
}
Which of the following client calls will always result in the variable clientVal being incremented by exactly 1?
 
    A.  
   clientVal = update( y );
    B.  
   y = update( clientVal  );
    C.  
   clientVal = update( clientVal  );
    D.  
   update( clientVal  );