TASK 4 You are given the following set of relations. COMPANY (name, city, country) DANCER (did, name, birthyear, country) SHOW (sid, title, choreographer, composer, year) ROLE (did(FK: dancer.did), sid FK: show.sid), role, companv(FK: company.name)) Write the following queries as Relational Algebra Expressions. 1) Find all dancers who worked with at least 3 choreographers in companies that are originated in Russia. 2) Find all shows whose choreographer is also choreographer of the show that Maria who is a German dancer performed in 2016 for Martha Graham Dance Company. 3) Find all companies that has exactly 9 shows in 1999 and dancers of the shows are Italian