Scheme: employee (person name, street, city) works (person name, company_name, salary) company (company name, city) manages (person name, manager_name) Give an expression in relational algebra to express each of the following queries: a. Find the names of all employees who work for First Bank Corporation. b. Find the names and cities of residence of all employees who work for First Bank Corporation. C. Find the names, street address, and cities of residence of all employees who work for First Bank Corporation and earn more than $10,000 per annum. d. Find the names of all employees in this database who live in the same city as the company for which they work. e. Assume the companies may be located in several cities. Find all companies located in every city in which Small Bank Corporation is located