GTM uses Auto Discovery to add virtual servers from both LTM and non-BIG-IP load balancers.

True is incorrect because Auto Discovery exclusively supports BIG-IP LTM devices - it has no mechanism to query or discover virtual servers hosted on third-party or non-BIG-IP load balancers.

The Auto Discovery feature in BIG-IP GTM (DNS) works by querying BIG-IP LTM devices that are defined as server objects, automatically populating their virtual server list via iControl. Non-BIG-IP load balancers lack this iControl integration, so their virtual servers cannot be auto-discovered and must be added manually as generic host or external load balancer objects in the GTM configuration.