In a hospital database. How would you represent the PATIENT room number? Answers: An attribute of DOCTOR entity set a. b. A relationship set between PATIENT and HOSPITAL An attribute of PATIENT entity set C. d. A primary key attribute of ROOM entity set. in a company database, an employee must work in at least one project? How would you represent the cardinality and participation constraints of the relationship work? Prom employee to project: One to many partial participation in both sides of the relationship From employee to project Many to many total participation at the employee side, partial participation at project side. From employee to project Many to one, total participation at the employee side, partial participation at project side. From employee to project One to many, total participation in both sides of the relationship