Final answer:
Jason likely chose an internal networked e-mail system for increased security, ensuring emails are only sent to coworkers and allowing for file sharing through attachments.
Step-by-step explanation:
Jason has chosen an internal networked e-mail system for his business instead of an Internet-based system. He most likely made this choice because an internal networked e-mail system provides increased security. When using an internal system, emails can be contained within the company's private network, reducing the risk of confidential information being intercepted by external entities. Additionally, an internal networked e-mail system allows e-mail to be sent only to coworkers, which can help ensure that communications are kept within the intended audience, further protecting sensitive information. Finally, an internal system often also allows for the sharing of files by sending attachments, which can include documents, spreadsheets, presentations, and other types of files crucial for business operations.