Which of the following could be referenced to determine if a host HBA has properly registered in an FC fabric?

An Alias server or aliasing is used to assign human-readable names to WWNs for easier management, but it's not the primary source for checking device registration in the fabric.

Fabric service is a general term for services provided by the FC switch (like Name Server, Zoning Service, etc.), not a specific component to query for HBA registration.

DNS (Domain Name System) resolves human-readable hostnames to IP addresses in IP networks and is not used for device registration in a Fibre Channel fabric.

In a Fibre Channel (FC) fabric, the Name Server (or Fabric Name Server) is a critical component that maintains a database of all logged-in devices, including their World Wide Names (WWNs), port types, and addresses. Querying the Name Server allows an administrator to verify if a host HBA has successfully registered and is visible within the FC fabric.