A marketing associate wants to ensure that an email will be delivered to a subscribers' inbox. What tool can the associate use to scan the subject line and the body of the email message for words and phrases that would be flagged by spam filters?

Northern Trail Outfitters wants to use something other than an email address to identify subscribers.
What functionality can be used to accommodate this?

Which data model should be used to create a Group?

Northern Trail Outfitters (NTO) notices a larger than normal drop in engagement and a spike in unsubscribes after its sales team added a newsletter that is sent three times a week, in addition to the normal commercial marketing messages sent throughout the week.
Which action should be taken to reduce the number of unsubscribes and increase engagement for NTO's program?

A marketer wants to create an email that will look great on both a desktop computer and a mobile device.
However the marketer is not familiar with writing code for responsive design and does not have available resources to design the email. Which template can the marketer choose when creating an email?