Consider the database schema below: Company (ID: integer, Name: String (unique), Address) Department (No: integer (not null),

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Consider the database schema below: Company (ID: integer, Name: String (unique), Address) Department (No: integer (not null), CompanyID: Integer, DepartmentName: String) Is it valid for Department to have unknown No? No, violates domain constraints. No, violates key constraint. Yes. No, violates entity Integrity constraint No, violates referential integrity constraint.