The following tables form an instance of an Airport Database held in a relational DBMS: Airport (airportiD, name, city, state, country) Carrier (carrierID, name, fleetSize, employees, revenue) Flight (carrierID, flightNo, date, time, airportID, destination, distance) Airnane: - Each airport name is unique in its country. Carrier - Each carrier name is unique in the whole world. - Any (carrierID, flightNo) combination is unique for the whole day. 1. What is the cardinality of the Flight table? 2. What is the degree of the Flight table? 3. List the candidate key(s) of the Airport table (each in a separate line). 4. List the candidate key(s) of the Carrier table (each in a separate line). 5. List the foreign key(s) of the Flight table (each in a separate line). 6. If the airportID is the primary key of the Airport table, list the alternate key(s) of this table. 7. What is the primary key of the Flight table