The correct answer is to investigate the cause before tailoring the process; the primary focus is to find out why there is a need to increase the WIP limit. (It’s likely due to the number of open items being worked on simultaneously).
The other responses are incorrect. Because too many items in WIP often lead to a bottleneck, the team should first understand why an increase in WIP limits is being requested. In addition, there’s no need to require a change in communication,
nor to calculate throughput or cycle time.