Which is NOT a structure of service desk that is described in the ITIL service operation guidance?

Local is a valid ITIL service desk structure in which the desk is physically co-located with the user communities it supports.

Centralized is a valid ITIL service desk structure that consolidates multiple teams into a single location to reduce costs and improve consistency.

ITIL service operation guidance formally describes only three service desk structures - local, centralized, and virtual. Outsourced is a sourcing arrangement that describes who staffs the desk, not how the desk is physically or logically structured, so it does not appear as a named structure in the framework.

Virtual is a valid ITIL service desk structure in which analysts are distributed across different locations but function as a single unified desk through shared tools and processes.