One core team member currently completes most of the work and ensures tasks are finished, but they will soon leave the project, creating vulnerability. What should the project manager do?

The correct answer is to assess a mechanism for knowledge transfer among the team members. This directly addresses the vulnerability created by a key team member's departure by ensuring critical knowledge and skills are retained within the project. This proactive approach mitigates risks and maintains project continuity. Distributing activities without knowledge transfer is insufficient, as the team may lack the expertise to perform them effectively. Asking HR to counsel the team member is irrelevant to the project's operational risk. Motivating the team member to stay with incentives is a short-term solution that doesn't resolve the underlying single point of failure or prepare for future departures.