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Activity - 1:Why is the ER model considered a top-down approach? Describe the four basic componentsof the ER model.Activity - 2:The ER model uses a number of notations and tags to represent different concepts. Outlinehow the basic ER components are represented in an ER diagram.Activity - 3:Describe what attributes represent in an ER model and provide examples of simple,composite, single-value, multi-value, and derived attributes.