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

Northern Trail Outfitters (NTO) stores sales representative information in a data extension. NTO wants to personalize the From Name in emails with the targeted customer's specific representative.
Which functionalities accomplish the requested configuration?

Northern Trail Outfitters it sending a welcome email to a new group of customers. When the marketer deploys the email, no one receives it.
Which configuration caused the send to fail?

An account has a Subscriber Key enabled, and will be providing a unique key for each subscriber from an external system. A marketer wants to create a data extension for sending email campaigns. What steps would the marketer take when creating the data extension? (Choose 2)

Northern Trail Outfitters' wants to use a partner to develop dynamic emails. After submittal, the marketing team wants to make sure the emails are reviewed before approval.
What feature should they employ?