You Have Planned, Tested, and Performed a Jira Upgrade

You have planned, tested, and performed a Jira upgrade. The upgrade appeared to be a success; however, after several hours of use, your users are reporting significant problems and you decide to roll back. Which two effects do you expect to see after the rollback? (Choose two.)

A) Emails will automatically be sent out to tell people about the rollback.
B) New issues entered between upgrade and rollback will be lost.
C) The color scheme will be set back to default to indicate there was a rollback.
D) Jira will go back to the same schemes as before the upgrade.
E) Jira will need to be reconnected to other systems it was integrated with.