Clarify the intent of this query

What can you do to improve this query with respect to conveying it's intent for future readers?

SELECT x1.customer_id, x1.rental_date, x1.return_date 
FROM rental x1
JOIN inventory x2
    ON x1.inventory_id = x2.inventory_id
JOIN film x3
    ON x2.film_id = x3.film_id
WHERE x3.length < 90;

Answer the question

50 XP

Possible Answers

Use aliases that help clarify the table source (e.g. x1 -> r or ren).
press1
Ensure that all aliases commands use AS.
press2
Clarify the type of JOIN being used by using INNER JOIN instead.
press3
Add a comment to clarify that the inventory table is used to unite the rental and film tables.
press4
All four steps would help convey the intent of this query.
press5