What can a marketer do to enhance a Welcome Series campaign? (Choose 2)

Northern Trail Outfitters (NTO) has a small catalog of items featured in company emails. The NTO marketing team manages what images, copy, suggested items, and call-to-action are used with each item in this catalog within a database. This data is saved into a data extension in Marketing Cloud and then called into the emails dynamically.
Each time a change is made to the content, a new, updated file is dropped on NTO's SFTP. A proof email is then sent to business stakeholders for final approval.
Using Automation Studio, how can NTO ensure that the catalog stays up-to-date?

A marketer has created a primary data extension that contains all active subscribers with fields containing key demographics and subscriber attributes. Each week, there are up to 10 teams that send to segments of their subscriber base.
What should they use to ensure they have fresh data for these sends?

Northern Trail Outfitters is redesigning its brand guidelines and wants to ensure its emails are accessible.
Which best practice should the email designer follow to meet accessibility standards?

Northern Trail Outfitters (NTO) is having an issue with bad email addresses coming into its website email signup form, impacting deliverability and sender reputation.
What should NTO use to make sure email addresses are valid before adding to its audience?