Explanation
To ensure Individual Email Results are pushed back into Sales Cloud for a particular send, the admin should confirm that the data extension is located in the Salesforce Data Extensions folder. The Salesforce Data Extensions folder is a special folder that contains data extensions that are integrated with Salesforce CRM via Marketing Cloud Connect. Only data extensions in this folder can be used for sending emails with Individual Email Results tracking enabled. The other options are incorrect because:
* The send relationship links Subscriber Key to Subscribers on Email Address. This is a setting that defines how subscribers are identified and matched between a sendable data extension and All Subscribers. However, this setting does not affect whether Individual Email Results are pushed back into Sales Cloud; it only affects how email addresses and subscription statuses are updated in Marketing Cloud.
* The data extension is located in the Synchronized Data Extensions folder. The Synchronized Data Extensions folder is a special folder that contains data extensions that are synchronized from Salesforce CRM via Marketing Cloud Connect. However, these data extensions cannot be used for sending emails directly; they can only be used as sources for filtered or query-based data extensions.
* The triggered Send Data Extension data extension template was used. This is a predefined data extension template that contains a set of standard fields for logging triggered send data. However, this template does not affect whether Individual Email Results are pushed back into Sales Cloud; it only
* affects what information is stored in Marketing Cloud.