Which option would add the code that was created outside of the Salesforce Marketing Cloud to the email?

Northern Train Outfitters (NTO) finds 57% of its subscribers read emails on smartphones. Because of this, NTO wants to enhance its email viewing experience by thinking "mobile first". NTO has the resources to write the HTML and CSS Code needed to create responsively designed emails.

Which option would add the code that was created outside of the Salesforce Marketing Cloud to the email?

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