The suggested answer is B.
To minimize data loss in the event of a planned power outage at Site A, the correct procedure is to execute a 'Planned Failover.' This method involves synchronizing the data between the primary site (Site A) and the secondary site (Site B) before shutting down the primary site. By doing this, you ensure that the most recent data is replicated to Site B, reducing the risk of data loss. This process is managed through the disaster recovery software, such as Veeam Backup & Replication, ensuring that the transition is seamless and that the virtual machines (VMs) start correctly at Site B.