Consider the following schema and answer the following questions: Users(userld: integer, userName: varchar, userCity: varchar) Comment(userld: integer, pictureld: integer, score: integer, commentText: varchar) Picture(pictureld: integer, title: varchar, description: varchar, userld: integer) a Write the following queries in relational algebra. i. Find the username of users who are from 'Muscat'. ii. Find the IDs of pictures which scores more than 2000 likes. iii. Find IDs of pictures which descried as landscape.

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A: the solution is an given below :

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