Which filtering dimension should a Practitioner use to identify responders in a cross-channel campaign?

A Campaign has a scheduler set up to run weekly. The scheduler triggers a recurring delivery and a continuous delivery.
How many records are created in the delivery table at the end of 3 weeks?

A new sample file is needed for a data loading process with a new layout. You have clicked auto detect format.
What step you should take?

A Business Practitioner is sending an email to the general public.
How does the Statistic 'Distinct opens for the population reached' compare to the actual number of recipients that opened the email?

More than one person in an approval operator group responds to an approval activity that requires a single response. What is the result?