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World Traveler Case Draw an entity-relationship diagram that describes the following business environment. You should submit an electronic version of the assignment through LMS. You may use any tool you like or you may draw the ER diagram using paper and pencil; however, you have to make sure your diagram is readable. Please note any assumptions you make while you draw your diagram. World Traveler is a cruise company that has several ships that travel to various regions. The company has a variety of cruise itineraries that involve several ports of call in each region. The company wants to maintain information on the sailors who currently work on each of its ships. It also wants to keep track of both its past and future cruises and of the passengers who sailed on their cruises in the past and also passengers have booked for their future cruises. Each ship has at least one and, of course, normally many sailors on it. The unique identifier of each ship is its ship number. Other ship attributes include ship name, weight, year built, and passenger capacity. Each sailor has a unique sailor identification number, as well as a name, date of birth, and nationality. A sailor may have multiple nationalities. Some of the sailors are in supervisory positions, supervising several other sailors. Each sailor reports to just one supervisor. Some of the sailors are permanent employees; others are contractor employees of the company. For the contractors, the company would also like to keep track of the contract end date. The company offers health insurance plans for the dependents of the permanent sailors, so it needs to keep track of the dependents of permanent employees. The attributes for the dependents are social security number, name, date of birth. A cruise is identified by a unique cruise serial number. Other cruise descriptors include a sailing date, a return date and a departure port (a departure port is also the return port) for the cruise. Clearly, a cruise involves exactly one ship; over time, a ship sails on many cruises, but there is a requirement to be able to list a new ship that has not yet sailed on any cruises at all. Each cruise stops at at least one and usually several ports of call, each of which is normally host to many cruises, overtime. The company would like to keep track of the ordering of the ports that will be visited by a cruise. In addition, the company wants to maintain information about ports that it has not yet used in its cruises but may use in the future. A port is identified by its name and the country it is in. Other information about a port includes the region it is in, whether a passport is required for passengers to disembark there, and its current docking fee, which is assumed to be the same for all ships. Passengers make bookings for cruises through travel agents. They cannot book a cruise directly. Passenger information includes a unique passenger number, name, home address, nationality, and date of birth. A passenger may also have multiple nationalities. A cruise will have many passengers on it (certainly at least one). For a person to be of interest to the company, he or she must have sailed on or be booked on at least one or more of the company's cruises. A travel agent is identified by a unique agent number. The other attributes of a travel agent include, name, address, phone number. A passenger may use different travel agents to make bookings for different cruises over time. The agents make contracts for different cruises to be able to make bookings for them. The company does not keep track of agents, which have not made any bookings. The company wants to keep track of how much money each passenger paid (or will pay) for each of their cruises, as well as their satisfaction rating for each cruise