What does the Content Type field identify?

The Content Type field identifies the file format of the email. This field specifies the type of data contained in the email, which can include formats such as text/html for HTML emails, text/plain for plain text emails, and various other media types. Correctly identifying the content type is crucial for email clients and servers to accurately render the email's content and ensure it is displayed correctly for the recipient.

Understanding the content type is especially important when an email includes attachments or multimedia components, as it helps the receiving system understand how to process and present that information to the user. While other options address aspects of email, none directly pertain to defining the file format in the way the Content Type field does.