How do you use data designer to link the web analytics data to your subscriber 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?

How do you add a contact in contact builder?
Choose 2

Subscribers are collected on a customer's website whose subscription database of record is Salesforce Marketing Cloud. The customer sends up to 5 emails per week based on subscriber activity.
The list is:
* Compiled in a database in the website Content Management System (CMS).
* Imported into Marketing Cloud nightly at 11 p.m.
What action should be taken if a third party is sending a message for the customer outside of the Marketing Cloud?

The Corporate Apparel Division of Northern Trail Outfitters (NTO) is moving to Marketing Cloud and will be using NTO's existing account. The Corporate Apparel team has asked for a recommendation on whether they should have a separate Business Unit.
Which consideration warrants the creation of a separate Business Unit for Corporate Apparel's instance of Marketing Cloud?