4. You are required to create a conceptual data model of the data requirements for a company that specializes in IT training. The Company has 30 instructors and can handle up to 100 trainees per training session. The Company offers five advanced technology courses, each of which is taught by a teaching team of two or more ctor is assigned to a maximum of two teaching teams or may be assigned to do course development on one or more new courses. Each training session presents exactly one of the company's advanced technology courses. a. Identify the main entity types for the company. b. Identify the main relationship types and specify the multiplicity for each relationship. State any assumptions you make about the data. c. Using your answers for (a) and (b), draw a single ER diagram to represent the data requirements for the company