What is a benefit of using a custom CodeQL configuration file?

A custom CodeQL configuration file can be stored in an external repository and referenced by multiple repositories. This allows an organization to centralize query packs, additional queries, query filters, path exclusions, threat-model configuration, and other CodeQL settings rather than duplicating the same settings across many workflow files. GitHub explicitly documents centralized configuration as a benefit of external configuration files. A token may be required when an advanced-setup workflow retrieves a configuration file from a private external repository, but providing the token is not the purpose of the configuration file itself. Likewise, a configuration file does not automatically choose a package, and query packs do not inherently disable the default query suite. Default queries are disabled only when the appropriate configuration option is deliberately specified. Therefore, C is correct.