You have received an RFC to install a patch onto a Linux server during the next maintenance period. Which of the following CR documents would tell you the reason for the change?
The purpose document should describe why the change is needed and has been requested, for example to patch a known security vulnerability or to fix a bug or issue.
Wikipedia
A change request, sometimes called change control request (CCR), is a document containing a call for an adjustment of a system; it is of great importance in the change management process.