The release planning and coordination process in ITIL 4 Release Management requires inputs toensure effective planning and execution of releases. TheITIL® 4 Practitioner: Release Managementdocument specifies:"Key inputs to release planning and coordination include details about the users who will be affected, as this helps in scheduling and communicating the release to minimize disruption"(Section 3.2.1).

Option A (Documented findings on the success of a release) is an output of a release evaluation, not an input to planning.

Option B (Updates to the continual improvement register) may inform long-term improvements but isn’t a direct input to planning a specific release.

Option C (Details about the users who will be affected) is a critical input, as understanding the user base helps tailor the release schedule, communication, and impact mitigation strategies.

Option D (Notifications to stakeholders about the release status) is an output of the release process, not an input to planning.

The correct answer is C, as user details are essential for effective release planning and coordination.