Explanation
The Marketing Cloud admin should consider that building desirable sending history and data will be variable based on list size and engagement when sending from the new IP address. A new IP address has no reputation with ISPs and needs to be warmed up gradually by sending emails to engaged and active subscribers. The send volume and frequency should be adjusted according to the list size and engagement level of NTO's subscribers to avoid being marked as spam or blocked by ISPs. The other options are incorrect because:
* The IP address is on reserve, is already in use, and has an email sending history. This describes an existing IP address, not a new one. An existing IP address already has a reputation with ISPs and does not need to be warmed up.
* Sending in large volumes will alert ISPs the new IP Address is now in use. This is not a consideration, but rather a mistake. Sending in large volumes from a new IP address will raise red flags with ISPs and may result in poor deliverability or blacklisting.
* Migration of larger marketing campaigns is necessary prior to bringing on smaller, triggered campaigns.
This is not a consideration, but rather the opposite of what should be done. Migration of smaller, triggered campaigns should be done first before bringing on larger marketing campaigns, as this will help build trust and reputation with ISPs.

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.

Explanation
The out-of-the-box Subscription center can display Publication Lists and Lists as options for subscribers to opt in or out of. Data Extensions and Groups are not supported by the default Subscription center.