The correct answer to this open question is the following.
Unfortunately, you forgot to include the options for this question.
However, trying to help you, we can comment on the following.
The process you were performing to make this determination was "Perform quality control."
This is the correct process because using quality control, you as the project manager of the Large Arch project that generates a software product ask the Quality Contro department to closely monitor that everything is made under the precise indications and standards dictated by the project. That is why the QA team could discover a critical bug in the software because they were monitoring the process and paying close attention to every detail. To have a solution ready in place, you meet with the experts to determine a workaround for this bug to keep the project on track.
That is the job of the QA team, to detect on time any flaw in order to make the proper corrections.