Figure 2.17 Employee database: employee (ID, person_name, street, city) works (ID, person_name, company_name, salary) company (company_name, city) 2.6 Consider the employee database of Figure 2.17. Give an expression in the relational algebra to express each of the following queries: a. Find the name of each employee who lives in city "Miami". b. Find the name of each employee whose salary is greater than $100000. c. Find the name of each employee who lives in "Miami" and whose salary is greater than $100000