In ServiceNow, Application Files are configuration records that define the various components and logic that constitute an application. These include artifacts such as:
Business Rules
Client Scripts
UI Actions
Script Includes
Tables and Fields
Workflows
These artifacts collectively define the functionality and behavior of the application. When an application is developed, ServiceNow automatically creates and manages these Application Files to represent the application's components.
Option C is correct because Application Files are the fundamental building blocks that comprise a ServiceNow application, representing its various components and configurations.
Options A, B, and D are incorrect:
A: XML exports of an Update Set represent changes made to an instance but are not synonymous with Application Files.
B: CSV files are typically used for data import/export and do not represent the configuration components of an application.
D: An XML export of table records pertains to data within a table, not the configuration artifacts that define application behavior.

https://docs.servicenow.com/bundle/tokyo-platform-administration/page/administer/platform-events/reference/r_

https://developer.servicenow.com/dev.do#!/learn/learning-plans/rome/new_to_servicenow/app_store_learnv2_securingapps_rome_application_access
https://docs.servicenow.com/bundle/rome-application-development/page/build/applications/concept/c_ExampleDenyingAllDesignAccess.html

https://docs.servicenow.com/bundle/tokyo-application-development/page/script/server-scripting/concept
/c_ServerScripting.html