Final answer:
The top of the Hootsuite Organizations structure is the Enterprise level, which is the highest tier in the hierarchy, providing extensive features and administrative controls suitable for large-scale businesses.
Step-by-step explanation:
The top of the 'Hootsuite Organizations' structure is the D) Enterprise. Hootsuite's organizational structure is designed to provide a scalable solution for social media management across complex and large organizations. At the pinnacle of this hierarchy is the Enterprise level, which serves as the central or highest tier, overseeing multiple teams, groups, and divisions that fall beneath it in the structure.
Normally, Enterprise accounts have the most comprehensive features and administrative controls available on Hootsuite, catering to the needs of large businesses managing various social media strategies and campaigns.