Draw the relationships that are described by the following business rules. Include the multiplicities for each relationship. a) A patient must be assigned to only one doctor and a doctor can have one or many patients. b) An employee has one phone extension, and a unique phone extension is assigned to an employee. c) A movie theater shows at least one movie, and a movie can be shown at up to four other movie theaters around town. d) Wall is part of a classroom. e) A customer may order up to 10 items