The following code snippet is to extract columns from a particular row in PHP and display them in a HTML page. There are three columns in the DB table in this order: isbn, author, and title. Code the missing three lines of code in X below. Note that this is a numeric array.

$result->data_seek($j); //$j is a counter in a loop

$row = $result->fetch_array(MYSQLI_NUM);

echo <<<_END

_________x__________;

_________x__________;

_________x__________;

_END;