A functional manager pulled a resource from a current project to work on a higher-priority project but did not offer a backfill resource.
Which of the following should the project manager do FIRST?

A. Report the project as at risk and share the issue with the project team.
B. Meet with the functional manager to discuss the issue.
C. Delay the task in the schedule and inform the sponsor.
D. Open a change request to reduce the project scope.