Consider the following an ER-diagram Date Time Time_stamp SHIP_MOVEMENT Longitude N Latitude HISTORY Type Tonnage Hull Sname N SHIP TYPE SHIP_TYPE Owner (0,1) 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 1 ON SEA OCEAN/LAKE Map the above ER-diagram into a relational schema and specify all primary keys and foreign keys