Explanation
According to the PMBOK Guide, a project manager should monitor and control the project work by tracking the progress and performance of the project team and external partners. If a team member reports some delays due to a component managed by an external vendor, the project manager should ask the team member to provide details to address the issue with the vendor. The project manager should also facilitate the communication and collaboration between the team member and the vendor to resolve the issue and ensure the quality and timeliness of the deliverable. Asking the team member to provide details is the best option, as it shows the project manager's support and involvement in the issue. Implementing fast tracking, updating the communications management plan, or asking the team member to resolve the issue independently are not the best options, as they do not address the root cause of the issue and may create more risks or conflicts in the future. References: PMBOK Guide, 7th edition, page 205-206, 211-212.