A project manager is overseeing the implementation of a major upgrade to a critical ERP system. The project sponsor is requiring that the upgrade should not exceed more than three hours of downtime for the implementation and validation in production. During cutover, the team runs into a validation issue after 2.5 hours, and the process is only 70% through the validation steps Which of the following actions should the project manager take?
A. Notify customers the downtime will take longer than expected
B. Add new team members to help speed up validation
C. Begin executing the rollback plan
D. Record the issue and proceed with the implementation