Northern Trail Outfitters (NTO) is the holding company of three subsidiaries: Universal Containers, Ursa Major Solar, and Cloud Kicks. NTO recently purchased Marketing Cloud and has asked its consultant to recommend a scalable business unit (BU) hierarchy. They don't plan on executing any marketing campaigns on behalf of the NTO holding company, but NTO employees would like access to all subscribers and aggregate reporting. Additionally, each subsidiary business will be regularly running campaigns and should have their own branding, content, and subscribers.
Which solution should the consultant recommend?