Comprehensive and Detailed Step-by-Step
Table Extension in ServiceNow:
Extending a table in ServiceNow means creating a child table based on a parent table. The child table inherits the fields, configurations, and functionality of the parent table.
What is Inherited:
Fields: All fields from the parent table are available in the child table.
Functionality: The child table benefits from any business logic or workflows defined for the parent table.
Access Controls: The child table respects the Access Control rules defined for the parent table unless explicitly overridden.
Why Other Options Are Incorrect:
Option B: This is incorrect because the new table does inherit fields from the parent table.
Option C: This is incorrect because you do not need to script or configure behaviors from scratch; they are inherited.
Option D: This is incorrect because Access Controls are not ignored; they still apply and can be extended or modified for the child table.
Reference:
ServiceNow Developer Documentation on Table Inheritance.

To see what scripts, reports, and other application artifacts will be in a published application, the best option is to examine the Application Files Related List in the application to be published. This will show all the application files that belong to the application, grouped by file type and scope. You can also filter, sort, or search the list to find specific files.
The following options are not the best ways to see what application artifacts will be in a published application:
Enter the name of the Application in the Global search field. This will perform a global text search on the instance and return any records that match the application name, which may include irrelevant or incomplete results.
Open the list of Update Sets for the instance. This will show all the update sets that have been created or imported on the instance, but not necessarily the ones that belong to the application to be published. Update sets are used to move customizations between instances, not to publish applications to the ServiceNow Store or Share.
Open the artifact records individually to verify the value in the Application field. This will require opening each record that may be part of the application and checking the Application field, which is tedious and error-prone. Reference: Publish an Application, Application Files

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

https://docs.servicenow.com/bundle/tokyo-application-development/page/script/useful-scripts/reference/r_Displa