Hootsuite’s ever-growing library of 100+ partner apps and integrations is called the:

The correct answer is App Directory. Hootsuite's "App Directory" is the official term for its collection of over 100 partner apps and integrations. This directory allows users to extend Hootsuite's functionality by connecting it with other tools they use for marketing, analytics, customer service, and more. The other options are incorrect because they are not the official terminology used by Hootsuite. "Hootsuite App Store" and "Hootsuite Library" are similar concepts but not the precise name. "Partner Upgrades," "Hootsuite Plug-ins," and "Add-ons" are generic terms that do not specifically refer to Hootsuite's integration marketplace.