A. Issue log: This is the central repository for tracking all issues encountered during the project, including their status, resolution plan, and responsible parties. The discovered invoice errors clearly qualify as issues that need to be documented and tracked for resolution.
D. Change log: Since the errors represent deviations from the originally planned invoices, they constitute changes to the project deliverables. Recording these changes in the change log helps maintain an accurate history of the project and assess the potential impact on scope, timeline, or budget.