Which of the following is the best definition of service management?

Describing service management solely as keeping services highly available is too narrow and focuses only on one quality attribute rather than the broader capability of delivering value.

This is the precise, official ITIL definition of service management. It emphasizes that service management is about organizational capabilities - people, processes, and tools - that are specialized and combined to deliver measurable value to customers. The definition deliberately focuses on value creation through services rather than technical availability or documentation.

Service management is not defined as documentation; while documentation supports it, defining it as a document set ignores the organizational capabilities, people, and processes that are central to the concept.

Calling it an internationally recognized methodology is inaccurate - ITIL is a framework, not a methodology, and this phrasing does not capture the core definition of delivering value through specialized organizational capabilities.