A. It serves as the boundary of the account's administrative domain, including license, inventory, and user management.

B. It contains Cisco Meraki devices, their configurations, statistics, and any client-device information.

C. It consists of multiple service provider resources, including support ticket management and API sandboxes.

D. It is defined by the user's network construct and categorized as either small-medium enterprise (SME), campus, or a distributed enterprise.