A university stores its students relation as heap file in 111 pages. The DBMS that the university uses has a total of 110 buffer pages and all buffer pages are initially empty. Consider the following query: SELECT FROM Student; which is executed frequently by the administrator and this is the only query that is executed in the DBMS. * a. (5 Points) Between LRU and MRU, which replacement policy should be used by the DBMS in order to minimize the number of I/Os? Explain why. b. (5 Points) Should the database administrator creates an index to speed up the query execution? If yes, which index structure should be used and why? If no, why not?