The addition, modification or removal of an authorized, planned or supported service or service component and its associated documentation is a definition of what?

ITIL defines a change as the addition, modification, or removal of anything that could affect IT services, including authorized, planned, or supported service components and their associated documentation. This definition distinguishes a change from the request to make one or the process used to manage it.

A change model is a pre-defined, repeatable approach for handling a specific category of change, not the definition of a change itself.

A change request is a formal proposal submitted to initiate a change, which is the trigger for the change process rather than the change itself.

A change advisory board (CAB) is an advisory body that supports change management by evaluating and authorizing changes, not a definition of a change.