Explanation
Email attachments is the Marketing Cloud product that NTO should purchase as a solution. Email attachments allows you to attach files such as PDFs or CSVs to your email messages. The files are stored securely in Marketing Cloud and are not publicly accessible. Distributed sending is not a suitable solution because it allows franchisees to send their own emails using NTO's content, not receive emails from NTO. Content syndication and Analytics Builder are not relevant for this scenario.