Northern Trail Outfitters wants to optimize email engagement.
Which elements could they test using the A/B Test feature?

Northern Trail Outfitters (NTO) has planned cross-channel marketing efforts based on how a subscriber responds to an email and when they last purchased. NTO is evaluating both Automation, Studio and Journey Builder for its campaigns and are leaning towards Journey Builder due to the available Activities.
Which tree standard Canvas Activities are available in Journey Builder? (Choose three.)

A marketer wants to delete subscribers from a data extension if the records are older than 30 days. How should the marketer accomplish this task?

When the number of subscribers exceeds one million records, which data model is preferred?

An email marketer needs a point-and-click tool to create a segment based on everyone who lives in a five-mile radius of a specific zip code and to see an accurate count of subscribers in real time.
What solution meets this specification?