What type of reports must a COR prepare regularly?

The correct answer indicates that a Contracting Officer Representative (COR) must prepare performance reports regularly. These reports are essential for tracking the contractor's adherence to the performance standards outlined in the contract. They help assess whether the contractor is fulfilling their obligations and maintaining the expected quality of work.

Regular performance reports allow the COR to communicate effectively with stakeholders regarding how well the contract terms are being met. Additionally, these reports can assist in identifying areas where the contractor may need improvement or where more oversight is required. This ongoing evaluation is crucial for ensuring that the project's goals are achieved and that resources are used efficiently.

In comparison, financial summaries, legal compliance reports, and marketing reports do not directly reflect the contractor’s performance against the contract deliverables in the same way that performance reports do. While these reports may be relevant in specific contexts, they are not the primary responsibility of a COR, who focuses more on monitoring and reporting on performance metrics related to the contract.