According to the description provided, when both systems A and B come back up at the same time, the process should involve a decision about which system should become active. However, the description states that if both systems come up simultaneously, one should become active based on a specific condition or precedence. Generally, in disaster recovery systems, there are protocols to avoid both systems becoming active simultaneously to prevent conflicts. Therefore, the transition where both A and B come back up at the same time and A becomes active while B becomes inactive without any conflict or decision-making step is incorrect.