問題文
An auditor examines the promotion of a new model version at a logistics company. The new version was evaluated in a test environment against a held-out set and met the criteria. It was then promoted directly to production. Which control step is most notably absent?
選択肢
- A review of the new version's code by a second developer, because a code review is the control that detects defects introduced during development and its absence means any error in the implementation would reach production without having been examined by anyone other than its author.
- A period during which the new version ran alongside the existing one on live traffic so that its behavior on current data could be compared before it took over.
- An assurance that the test environment's configuration matches production exactly, since any difference between the two environments means the evaluation results obtained in the test environment cannot be relied on as an indication of how the version will behave once promoted.
- An approval from the head of logistics recorded in the change management system before the promotion took place, naming the version promoted and the date it took over.