A marketer needs to test personalized content in an email prior to sending. How can the marketer easily minimize the possibility of someone unsubscribing during the testing process?

A file is received daily from a data provider to the account SFTP. This file needs to be imported into Marketing Cloud as soon as it arrives. The arrival time of this file varies by several hours from day to day.
What tools should be used to accomplish this?

A marketer sends an email to a sendable data extension that contains a Customer_ID field with a numeric data type that relates to the Subscriber Key on the All Subscribers List as a Send Relationship.
Which two statements are correct about the email send behavior for any subscriber who currently does NOT exist on the All Subscribers List? (Choose two.)

Northern Trail Outfitters (NTO) has been sending email for about 10 years. A new marketing manager noticed NTO's deliverability continually decreased over the last year. NTO wants to grow its existing subscriber base and increase its ROI on email marketing by improving engagement with its subscribers.
Which three strategies will help improve NTO's email deliverability? (Choose three.)

A marketing associate wants to use the Validate button to ensure an email is CAN-SPAM compliant. What information does the associate need to provide in order for the email to pass validation? (Choose 2)