Consider the following an ER-diagram Date Time Time stamp SHIP_MOVEMENT Longitude Latitude HISTORY Type Tonnage Hull Sname N SHIP TYPE SHIP TYPE Owner (0) Start_date End_date N (1,1) HOME_PORT SHIP AT PORT PORT_VISIT Continent Name (0) N IN STATE/COUNTRY Name Pname PORT N ON SEA OCEAN/LAKE Map the above ER-diagram into a relational schema and specify all primary keys and foreign .keys