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What is the Entity-Relationship Model? - Diagram & Examples

SOLVED: It is an Entity-Relation diagram. I want answers for the questions posted.Study the partial (incomplete) E-R diagram shown below (assume all entities have ID attributes). Provide an appropriate example in support of your answer:a. How many CITIES can a TASK be done in?Could TASK be modeled as a ternary relationship between TOOL, PROJECT, and CITY? Why, or why not?Is it possible to attach attributes to the Usedon relationship? If yes, give an example; if no, explain why not.d. Should the