Solve the following questions: Bl. Write one of the integrity rules (constraints) (business rules) that should be enforced in this application with the suitable customized error message that should appear to end users in case of violating this rule. (5 marks) 1 B2. If most of the tenants searched for all the available apartments in a specific city, what would be the impact of this requirement on the design of your database? What are the advantages and disadvantages of this design issue