D gredtulakes.org Yahoo [4 pts] C following restriction: You may not choose a UoD based on any of the in-class or book examples. You can use the UoD you used for the practice in class hoose a UoD that is interesting to you. You may pick anything with the a. Create an external schema containing at least 4 entities. One of your entities should be a concept rather than an object. You must clearly describe your system. Describe the general sentence. Explain the relationships between the entities. b. Create an ER Diagram. Show everything illustrated in your external schema. Try to utilize many notations we've learned from class