Which two statements about a database of record are correct? (Choose two.)

If I want to introduce a new line of footwear. I am excluding anyone who does not have shoe as an attribute listed in their preference center. I plan to send the emails daily. After a short time, I notice many people updating their preferences, and less emails are going out.
What is the issue causing less emails to go out?

What are the similarities between Automation Studio and Journey Builder? (Choose three.)

A financial services customer states that families often share email addresses across multiple checking, savings, loan, and credit accounts. The customer needs to allow individual accounts to use the same email address in Marketing Cloud but maintain separate subscriber attributes.
Which component should be discussed with the customer to allow for this use case?

A customer is starting a new children's fashion brand and wants to use a dedicated business unit within their existing Enterprise 2.0 account. They anticipate many of their current Enterprise contacts will subscribe to the children's brand, however, they want to separate subscriber opt-outs of the Enterprise and children's brands.
The customer has minimal technical resources available for implementation and support.
What should a consultant recommend to meet these criteria?