(b) Consider a database with the following schema: Person ( name, age, gender) (name) is a key Frequents ( name, pizzeria) (name, pizzeria) is a key Eats ( name, pizza ) (name, pizza) is a key Serves (pizzeria, pizza, price ) (pizzeria, pizza) is a key Write relational algebra expressions for the following queries. a. Find all pizzerias frequented by at least one person under the age of 18. b. Find the names of all females who eat either mushroom or pepperoni pizza (or both). c. Find the names of all females who eat both mushroom and pepperoni pizza. d. Find all pizzerias that serve at least one pizza that Amy eats for less than $10.00. e. Find the names of all people who frequent every pizzeria Serving at least one pizza they eat. f.Find the names of all people who frequent only Pizzerias serving at least one pizza they eat