What guidance does ITIL give on the frequency of production of service reporting?

Which two elements of financial management for IT services are mandatory?

What is the type of notification that should be sent when a threshold has been reached, something has changed or a failure has occurred?

What is a characteristic of a process?

Which of the following should be done when closing an incident?
1. Check the incident categorization and correct it if necessary
2. Check that the user is satisfied with the outcome