A company's website development team made some code changes to implement a new feature. The development team published the changes via a code pipeline and verified that the feature is in the developme

Rolling back and reapplying changes is a corrective action, not a diagnostic step, and should only be taken after identifying the actual root cause.

Confirming deployment completion in the QA environment directly addresses the symptom - the feature exists in dev but is absent in test - by checking whether the pipeline stage that targets QA ran successfully. Many CI/CD pipelines require a manual approval gate or separate trigger to promote builds between environments. Verifying this first eliminates the most common and straightforward cause before taking any corrective action.

Switching the load balancer to a blue environment is relevant to a blue-green deployment strategy but is not a diagnostic step and could disrupt production traffic.

Updating CASB policies addresses access control restrictions, which is a less probable cause than a simple pipeline promotion failure and should be investigated only after confirming the code is actually deployed.