Explanation
When setting up Distributed Marketing, the admin should consider the following:
* Default options can be set up for the greeting in the email2. This allows the admin to define how the email will address the recipient, such as by first name, last name, or salutation2.
* A journey can be connected to one or more Campaigns2. This allows the admin to associate a journey with a Salesforce object, such as an opportunity or a case, and trigger personalized messages based on the Campaign status2.
* Messages can be sent to Contacts, Leads, and Person Accounts2. These are the supported recipient types for Distributed Marketing messages2. The other options are incorrect because:
* Business users cannot select any email at the time of sending2. They can only select from the pre-approved emails that are configured by the admin in Marketing Cloud2.
* The DM administrator Profile is not required to access Distributed Marketing2. The admin can use any Profile that has the appropriate permissions and settings for Distributed Marketing

To troubleshoot issues with outdated data from Sales Cloud in Marketing Cloud, the admin should:
* Check Synchronized Data Extensions: Navigate to Contact Builder and review the Synchronized Data Extensions. This area shows the synchronization status and configuration between Sales Cloud and Marketing Cloud.
* Data Refresh Rate: Verify how frequently the data is synchronized and ensure that the synchronization schedule meets the operational requirements, adjusting as necessary to ensure data is up to date.

In Salesforce Marketing Cloud, linking new data extensions in Data Designer to existing contact records requires using a "Unique Contact Identifier." This identifier ensures that each record in the data extension can be uniquely associated with a corresponding record in the contact database, thereby enabling accurate targeting, segmentation, and personalization. It is vital that this identifier is consistently used across data extensions to maintain data integrity and proper linkages.
Reference: https://help.salesforce.com/