Database Tables - Person(PName, Street, City, CName, Salary) - Company(CName, City, Sales) - Branch(CName, City) Write Relational Algebra expressions to receive the result for the following queries and Tuple Relational Calculus queries for the below to retrieve the result to first three queries. 3. Retrieve the names of all employees who work for companies that only have branches in Redmond. 4. Retrieve the names of all companies that have a branch in every city where "Microsoft" also has a branch