List the categories of active businesses in Surprise, AZ.
categories refers to category_name; active businesses refers to active = 'true'; in Surprise, AZ refers to city = 'Surprise' and state = 'AZ'
SELECT T3.category_name FROM Business AS T1 INNER JOIN Business_Categories ON T1.business_id = Business_Categories.business_id INNER JOIN Categories AS T3 ON Business_Categories.category_id = T3.category_id WHERE T1.active LIKE 'TRUE' AND T1.state LIKE 'AZ' AND T1.city LIKE 'Surprise' GROUP BY T3.category_name