You are in charge of designing the database for the Bixi Bike Rental System. $1.(55$ Points$)$ Below find the specification of the data requirements that should be captured in a database. Note that this is simplified version of the real Rental System. Design the E$/$R Diagram that captures the data described in this specification. Indicate any constraints that you might not be able to express in the E$/$R schema. For each entity set, decide on the primary keys. If you think there is no appropriate primary key, you can introduce an artificial key attribute. If there is some constraint that you think you cannot represent in your schema, indicate it$.$