SELECT * FROM R,S WHERE R.sid=S.sid; There are and unclustered- indexes on the R and S tables for the query. a. Which JOIN method is most likely to be used to process this query? What are all the possible access routes? Which is better? Does your answer change depending on whether the index is B+-tree or Hash? b. Query SELECT count(*) FROM R,S WHERE R.sid=S.sid; If so, would your answers change?