Consider the database schema below for cities in countries. A country have many cities, and the same city name can be found in different countries. Country (ID: integer, Name: String (unique)) City (serialNo: integer (unique, not null), CountrylD:Integer, CityName: String, Population: integer) A city can have unknown serialNo? O Yes. O No, violates domain constraints. O No, violates key constraint. ) No, violates referential integrity constraint.

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Q: Task

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