QUESTION 01 Points[2.5+2.5+05] A) Convert the given query into relational algebraic expression also design query tree. SELECT 3.name, e. gubi FROM Students 3, Enrolments e WHERE id = e.sid AND e.mark > 50; B) The following query returns information about all persons who have acted in a play that they have written: SELECT a.name...title.c:character name FROM Actor a Play Roler Where a.name=p.author AND a.actor_id=c.actor_id AND p.play_id=r:play.id Give a relational algebra query plan drawn as a tree that correctly computes this query. C) Explain following diagram SOL Parser RA Exp SQL DB Engine Relops Optimiser Output Tuples Display Results