What are the benefits of using a centralized CodeQL repository for queries?

• A. Slower development, more conflicts, less sharing, inconsistent results.
• B. Higher cost, more complexity, less security implications.
• C. Reusability, versioning, easier maintenance, consistent results across projects, easier upgrades.
• D. None of the above.

Answer: (C)

Centralizing CodeQL queries into one repository makes it easy to reuse the same queries across projects. With a single source of truth, you can version the queries, pin projects to specific versions, and manage changes in a controlled way. This reduces duplication and drift, because updates are made in one place and then adopted by all projects that depend on the repository. Maintenance becomes easier since fixes, improvements, and new checks are applied once and propagated; you avoid maintaining multiple independently evolving query sets. Consistent results across projects follow from using the same queries against similar data sources, so findings are comparable rather than varied by local customizations. Upgrading is simpler too: you can release a new version of the query suite, test it, and gradually roll it out to consuming projects through version bumps, minimizing disruption. In short, reusability, versioning, easier maintenance, consistent results across projects, and easier upgrades are the key benefits. Those alternatives describe the opposite of what a centralized repository provides.