How can an application link to a repository behind a firewall?

How can an application link to a repository behind a firewall?
A . This option is not supported.
B. Link an application to source control through a MID Server.
C. Link an application to source control through an access token.
D. Link an application to source control with multi-factor authentication.

Answer: B

Explanation:

"Use an existing MID Server to connect to a Source Control repository. Linking or importing an application through a MID Server enables access to repositories behind a firewall." https://docs.servicenow.com/bundle/tokyo-application-development/page/build/applications/concept/c_SourceControlIntegration.html