Which method of storing subscriber information allows a marketer to easily create different subscriptions that subscribers can opt into from the default Subscription Center?

Northern Trail Outfitters' (NTO) branding guidelines require heavy use of imagery on its website, apps, emails, ads, etc.
What are two ways that NTO can optimize its email design to honor branding guidelines and ensure subscribers are getting the best experience possible? (Choose two.)

NTO wants to create a dynamic welcome series to make each email more relevant to its subscribers the 2nd email in the series should send customers down a predetermined path based on click activity within the first email. Which journey builder activity should be used?

What are some of the acquisition method for allowing subscribers to opt-in to receiving email? (Choose 3)

Northern Trail Outfitters (NTO) has created a new onboarding series for customers who have purchased its fitness tracker. Customers were automatically opted in and received three emails from NTO within one day. The onboarding series includes personalized recommendations but lacks an easy way to opt out or update preferences.
In this scenario, what best practice was achieved?