Free Salesforce Marketing-Cloud-Email-Specialist Exam Questions

Northern Trail Outfitters sends order confirmations to customers who have made online purchases. Delivery of these emails must follow the "Transactional" CAN-SPAM requirements. What feature should the marketer use?  

Approximately 50% of Northern Trail Outfitters' (NTO) subscribers open emails on their mobile devices, while the remaining 50% of subscribers open their emails on their desktop. The Chief Marketing Officer of NTO would like the emails to render well on both desktop and mobile devices, but does not want to spend a significant amount of time developing for each environment. What is the recommended design approach? 

Northern Train Outfitters needs to ensure that "Valued Customer" appears if no data exists in that field for a subscriber when using a personalization string to display the First_Name field in a data extension. How can the Marketer most easily achieve this during creation of the data extension?