To implement authentication via the web.config file, you need to include the authorization element.
Option A) Include the authentication element - This option is incorrect because the authentication element is used to configure authentication settings, such as the authentication mode and providers. It is not directly related to implementing authentication.
Option B) Include the authorization element - This option is correct because the authorization element is used to configure authorization settings, such as specifying which users or roles are allowed or denied access to specific resources. It plays a crucial role in implementing authentication by controlling access based on user credentials.
Option C) Include the identity element - This option is incorrect because the identity element is not directly related to implementing authentication. It is used to configure identity settings, such as impersonation and Windows authentication.
Option D) Include the deny element - This option is incorrect because the deny element is used within the authorization element to explicitly deny access to specific users or roles. While it is part of the authorization configuration, it is not the main element for implementing authentication.
The correct answer is Option B) Include the authorization element. This option is correct because the authorization element is used to configure authorization settings, which play a crucial role in implementing authentication.