Which one of the following would NOT be defined as part of every process?

Roles are a standard required component of every ITIL process definition, specifying who is responsible for each activity.

Inputs and outputs are fundamental to every process definition, describing what triggers the process and what it produces.

Functions in ITIL are organizational units (teams or groups of people and tools) that perform specific activities, and they are distinct from processes. A process definition includes roles, inputs, outputs, activities, metrics, and triggers - but 'functions' is a separate structural concept that exists alongside processes, not within their definition.

Metrics are a required element of every process definition, used to measure process performance and effectiveness.