Final answer:
In a Workflow editor, an activity is triggered based on the Activity trigger condition, which automates the process based on predefined conditions, rather than being manual or based on specific dates.
Step-by-step explanation:
Within a computer system that uses a Workflow editor for Lifecycle Events, tasks or approvals are typically triggered based on specific conditions that are defined within the system. The correct answer to the question is that the Activity trigger condition determines when an activity such as a task or approval should be triggered. This means that the workflow is designed to monitor certain conditions, and when those conditions are met, the associated activities are initiated.
For instance, in a project management workflow, a condition might be set that requires an approval step to be initiated when a document reaches a 90% completion threshold. Rather than having tasks manually triggered or automatically triggered on specific dates, the system relies on these defined conditions to ensure the appropriate sequence of actions takes place at the right time.