What are the key ways to improve email deliverability in email marketing? (Choose 4)

A marketer would like to improve open rates for weekly email campaigns.
On which area of email design should the marketer focus?

What is required on an email message by the United States CAN-SPAM Act? (Choose 2)

Northern Trail Outfitters (NTO) needs to create a sendable data extension that will contain its customers' information. NTO's customersare identified by a unique alphanumeric Customer ID, and Email Address is a required field.
How should the data extension be configured?

A marketer is using an import activity on a nightly basis to import subscriber data into a data extension. What is a true statement about the import activity? (Choose 3)