Northern Trail Outfitters (NTO) has been storing web behavior to a data extension for several years. They have indicated with several hundred millions of rows there has been an impact on performance. NTO indicates they only need to store data from the previous twelve months which will notexceed eighty million rows.
Which two methods would allow them to utilize a Retention Policy? (Choose 2 answers)

Northern Trail Outfitters received a complaint today from a customer who received an email after unsubscribing last week. Today's email was sent using Marketing Cloud Connect (MCC), though last week was sent when an external system dropped a file on the Marketing Cloud SFTP and triggered a User-Initiated Send through an automation.
What could be the reason the customer received the email through MCC?

Northern Trail Outfitters injects customers into journey B based upon email engagement in journey A.
Which method would facilitate this solution?

Northern Tril Outfitters wants to connect relational data into their Journey without overloading the entry data.
How should they connect the data?

Northern Trail Outfitters is using Journey Builder to send emails to loyalty members based on recent activity. They anticipate that approximately half of their contacts will meet the entry criteria for their journey.
How should they configure their entry source?