To which categories do the podcasts of the reviewer whose id is EFB34EAC8E9397C belong?
reviewer whose id is EFB34EAC8E9397C refers to author_id = 'EFB34EAC8E9397C'
SELECT DISTINCT T1.category FROM categories AS T1 INNER JOIN reviews AS T2 ON T2.podcast_id = T1.podcast_id WHERE T2.author_id = 'EFB34EAC8E9397C'