Develop an E-R diagram with the appropriate cardinality notations

Please explain this Enhanced entity-relationship (EER) Diagram (see attached photo)

What are the four various E-R diagram types that are produced during conceptual data modelling, and why are they studied?

Please provide a description of the best practices for developing excellent data-flow diagrams.

Data access, business logic, data presentation, and user interaction are all kept distinct using the Model-View-Controller design pattern. Additionally, it distinguishes data presentation from user interaction. Discuss or provide your thoughts on this explanation.

show me a picture of how to Create an ERD diagram using Visio or a related tool with tables, keys, columns, and relationships. Primary and Foreign keys need to be identified in this diagram.

This Schema diagram to ER diagram

Explain how an Entity-Relationship Diagram (ERD) is used to represent data in system modeling.

What are the four different types of E-R diagrams that are created and analyzed during conceptual data modeling and why?