An Adobe Campaign Classic Developer's client uses a unique customer ID to identify and contact their customers. This customer ID is a number. The client wants to send out a personalized email to all customers.
Which Exclusion setting can have a different impact if the ID would have been an email instead of a number?

What monitoring log should a Campaign developer look at for a database error in a query activity?

How should a Campaign developer prepare an encrypted flat file for use with a campaign workflow as the starting population?

What is an accurate description of the Adobe Campaign Hierarchy?

In a split activity, the Campaign developer defines the Segment Code for each subset and needs to use this value to select conditional content in an email delivery.
How should the Campaign developer reference the field in the delivery?