All 13 Mike loads his website visits data containing user id, d as a url and time of visit. How can he group visits based 3 on url? visits = load '/ data/visits' as (user, url, time); 7 22 SELECT THE CORRECT ANSWER 1:00:00 A. gVisits = group visits on url; O B. gVisits = group visits by url; O C. gVisits = group visits.url; O D. gVisits = group (visits.url)