Which Statement About the 'Change Enablement' Practice Is CORRECT

Which statement about the 'change enablement' practice is CORRECT?

A) Service requests are usually normal changes that can be implemented quickly without authorization
B) Emergency changes are changes that must be fully tested and fully documented prior to implementation
C) Standard changes are changes that need to be scheduled, assessed and authorized following a standard process
D) Emergency changes are changes that must be implemented as soon as possible and therefore authorization is expedited