Information Technology Infrastructure Library (ITIL) is
Option D- All of the above
Explanation:
The process ITIL can be defined as a set of well-defined practices for the IT service management which takes concerns on aligning the IT services based on the requirements of the business.
This describes the tasks, procedures, checklists and processes that are specifically not for organization or technology but can be adapted by the business entity towards the delivering-value, strategy or handling a lower competency level.
ITIL process was developed around as a process model-based view of managing and controling the operations of the organization which is credited to W. Edwards Deming and his plan-do-chec-act (PDCA) cycle.