Below is an ER diagram for an online shopping portal using the following scenario: A customer enters the shopping portal and places his/her chosen items in some carts. Then he/she proceeds to checkout and pays once using the same payment method for each cart. a.    Add an entity named "invoice" and connect it to the ER diagram. The entity should contain the following attributes: total cost of items mentioned in the cart, and the date. b.    Then, identify the primary keys, foreign keys, and the relationship between the entities (1:1, 1:M, M:M)

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A: the diagram is an shown below :

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Fundamentals of Managing Data

Data management is creating, organizing, storing and managing the data collected and created by any organization.Effective data management is a crucial part of today's world. Data management provides analytical information on the vast amount of data collected from business applications daily, which helps make critical business decisions and plan and bring out the best strategies.