Final answer:
On Smartscape, when a host goes offline for more than 2 hours, it is marked as inactive but remains visible, allowing users to maintain context for troubleshooting.
Step-by-step explanation:
When a host goes offline for more than 2 hours on Smartscape, the correct behavior is that the host is marked as inactive but remains visible. Smartscape is a feature of Dynatrace, a software intelligence platform that provides full-stack monitoring, including infrastructure, applications, and user experience. The purpose of this feature is to maintain a comprehensive view of your entire IT ecosystem, and when a host goes offline, marking it as inactive rather than removing it allows users to retain a full history and context for troubleshooting and analysis.