They’re not mandatory. Not all modules have infrastructure code, and not all have so complex business logic that would make the separation justified. The most important hint on introducing an infra-module is a need to unit test the Business-Module.
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"(1) Provide an accessible interface at account setup that requires an account holder to indicate the birth date, age, or both, of the user of that device for the purpose of providing a signal regarding the user’s age bracket to applications available in a covered application store.。safew官方下载是该领域的重要参考