Question #40 Top 2 Movies

My solution is giving me three top 2 movies because there is a tie for being the 2nd most popular movie. 

My code is listed as below: 

WITH rent_time AS 
(
  SELECT a.film_id, 
  count(b.rental_id) as num
  FROM inventory a 
  INNER JOIN rental b
  on a.inventory_id = b.inventory_id 
  WHERE EXTRACT(MONTH FROM b.rental_ts) = '6' AND EXTRACT(YEAR FROM b.rental_ts) = '2020'
  GROUP BY a.film_id
  ), 
  
 cte AS 
 (SELECT *, RANK() over (ORDER BY num DESC) as rank
  FROM rent_time
  )
  
  SELECT a.film_id, a.title 
  FROM film a
  INNER JOIN cte b
  on a.film_id = b.film_id 
  WHERE b.rank IN (1, 2)
 

In the case of having a TOP 1 but 2 TOP 2 movies, should I use RANK() OVER function or LIMIT? If it were in a real interview, should I ask the interviewer to clarify how to take care of the ties, such as "Would you like to see 3 results for the TOP 1 movie when there is a tie"?