Which ITSM standard focuses specifically on IT service management?

ISO/IEC 20000 is the correct answer as it is specifically designed for IT service management (ITSM) and outlines the requirements for establishing, implementing, maintaining, and continually improving an IT service management system. It provides guidelines for organizations to ensure that their IT services are delivered efficiently and meet the needs of customers. By following this standard, organizations can enhance service delivery and improve overall service quality.

In contrast, the other options focus on different areas. For instance, ISO/IEC 27000 relates to information security management systems and emphasizes protecting information assets, rather than the holistic management of IT services. Prince2 is a project management methodology, providing a structured approach for managing projects effectively, rather than focusing specifically on IT services. Six Sigma is a set of techniques and tools for process improvement, which can be applied across various disciplines, including IT, but is not limited to IT service management.