The "Multi Resource Support" property is used in custom workflow models in AEM to allow a single workflow instance to handle multiple resources, such as assets or pages. When this property is set to true, if multiple assets or pages are selected and theworkflow is initiated, AEM will start only one workflow instance instead of individual instances for each item. This is useful for bulk processing of resources, improving efficiency, and managing workflows better.

Option B, "Multi Resource Enable," is not a standard AEM workflow property.

Option C, "Transient Workflow," refers to workflows that do not persist their data and are not related to handling multiple resources in a single instance.