While closing a project and preparing handover to operations, a delayed invoice with higher-than-planned cost was submitted, delaying handover and increasing reported completion costs. What should the project manager have done to prevent this?

The correct answer is "Captured and reviewed all of the project work and related costs regularly." Proactive and regular monitoring of project work and associated costs is essential. This practice allows the project manager to identify discrepancies, track expenses against the budget, and address potential issues like outstanding invoices or cost overruns throughout the project lifecycle, not just at closure. This prevents surprises like a delayed, higher-than-expected invoice from impacting project closure and final cost reporting. "Notified all vendors about the invoicing and nonpayment deadlines" is a good practice but doesn't guarantee all invoices will be submitted on time or prevent unexpected cost increases. "Reviewed the total committed cost against the cost invoiced at project closing" is too late; the issue has already occurred. "Involved the finance team and discussed the issue with the vendor" is a reactive step to address the problem after it has arisen, not a preventive measure.