Involving third parties in problem management is often necessary when errors in third-party products are the root cause of problems within the service provider's environment. These errors can lead to incidents or disruptions, making it essential to collaborate with external vendors or partners to resolve such issues.

The 'request fulfilment control' process involves tracking and managing the lifecycle of service requests, ensuring that they are fulfilled according to agreed service levels. Part of this process involves gathering feedback, often in the form of user survey results, which provide valuable insights into user satisfaction and the quality of service fulfillment. User Survey Results: These results are critical for the 'service request review and optimization' process as they provide feedback that helps identify areas for improvement. Regular review of user feedback enables service providers to refine and optimize their request handling processes. Option B ("User survey results") is the correct answer because feedback from users is a direct input that helps assess the performance and efficiency of the service request process, enabling continual improvement.

At capability level 3, a practice is defined, achieves its purpose, and is integrated with other practices. This level indicates that the practice is functioning consistently across the organization and that it has been formalized and integrated into the organization's processes. Level 3 (Answer B - Correct): At this level, the problem management practice has been properly defined and integrated with other service management practices, such as incident management and change enablement. The organization has established workflows and procedures to ensure that problems are managed effectively.

A service configuration management system (CMS) provides accurate and reliable information about the configuration of services and their relationships, including known error records. For Problem Management, the CMS helps track problems, known errors, and workarounds effectively. It ensures that the necessary data is available to manage these records and keep them up to date, facilitating problem resolution and ensuring that workarounds remain effective.