Hosted 3D scene layers are stored in the tile cache data store, which is optimized for storing and serving cached 3D content, such as buildings and elevation surfaces. This data store supports scene layers published from ArcGIS Pro and allows for efficient rendering in 3D web scenes within the portal.
The relational data store is used for feature layers and structured tabular data. The raster data store supports large raster datasets for imagery layers. Neither is appropriate for 3D scene layer content. Thus, for hosted 3D scenes, the correct data store is the tile cache.
Reference Source: ArcGIS Enterprise Help - Data store types and publishing workflows

In ArcGIS Enterprise,data store itemsadded via the Portal (such as those using .sde files for SQL Server) are represented asportal items. To allow other users to publish using that data store, the administrator mustshare the item with them, typically via agroup.
From the official documentation:
"To allow other users to publish with a user-maintained data store, share the item with a group to which they belong. Users must have access to the data store item in the portal to publish services using it."
* OptionAis not required-users don't need admin rights to publish.
* OptionCrefers to registering data in Server Manager, not managing access.
* OptionDis not a valid setting for data store items.
Reference:ArcGIS Enterprise -Sharing Data Store Items for Publishing

To publish feature classes as services in bulk from an enterprise geodatabase, it must first be registered with the ArcGIS Server site. This registration tells ArcGIS Server where to access the data directly for referenced service publishing. The proper way to do this is through ArcGIS Server Manager.
From ArcGIS Enterprise documentation:
"To publish layers directly from a registered enterprise geodatabase without copying data, you must register the geodatabase with your ArcGIS Server site using ArcGIS Server Manager."
* Option B is used for hosted services, not referenced publishing.
* Option C is not the correct interface for registering data sources.
* Option D involves hosting data, which is not applicable for referenced layers from a geodatabase.
Reference:ArcGIS Server - Registering Data Stores for Publishing Referenced Services

To enable geocoding of addresses from CSV files uploaded to the ArcGIS Enterprise portal, the organization must designate a federated ArcGIS Server site as the hosting server. This hosting server must have a relational data store configured. Once set up, the portal can utilize a geocode utility service to process the addresses. This configuration allows users to map addresses from CSV files added to the portal.
Reference Source: ArcGIS Enterprise documentation on configuring the portal to geocode addresses

In ArcGIS Enterprise, when creating a new group, administrators have the option to designate it as an Administrative Group. This designation restricts members from leaving the group voluntarily; only the group owner or a group manager can remove members. This ensures that critical applications and content shared within the group remain accessible to all intended users, preventing disruptions caused by users inadvertently or intentionally leaving the group.
It's important to note that this setting can only be applied during the creation of a new group and cannot be modified later.
Reference Source:ArcGIS Enterprise documentation on creating administrative groups