Which statement is true regarding making changes to assignment rules?

Which statement is true regarding making changes to assignment rules?

A.
To make changes you must first deactivate the rule.

B.
If you make changes to a released assignment rule, you must release the rule again.

C.
Changes to a released assignment rule take affect automatically when the record is saved.

D.
Once an assignment rule is released it cannot be changed, it must be revised before it can be edited.