Salesforce Exam EEB101 Topic 1 Question 4 Discussion

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?