Which Statement Is True About Changing a Project's Key

Which statement is true about changing a project's key?

A) Users have to update issue filters referencing the old project key.
B) Unshared project schemes will be automatically renamed to reflect the new project key.
C) External links to issues in that project need to be updated to match the new project key.
D) The old project key can be reused for a new project.
E) Internal Jira links referencing an old key will continue to work.