Correct Answer: B, C, DAfter running the SD-WAN overlay template, three mandatory post-run tasks include: assigning a branch_id metadata variable to each branch device to ensure correct identification and management of branch devices, creating policy packages for branch devices to manage their traffic and security policies appropriately, and configuring SD-WAN rules to define the behavior and routing of network traffic over the SD-WAN environment. These tasks ensure that the SD-WAN deployment functions correctly and efficiently.