One of major features in R80.

One of the major features in R80.x SmartConsole is concurrent administration, which allows multiple administrators to work on the same Security Policy at the same time12. However, only one administrator can edit a rule at a time. If AdminA and AdminB are editing the same rule at the same time, it will cause a conflict and prevent them from saving their changes12. Therefore, the correct answer is B. AdminA and AdminB are editing the same rule at the same time.