Do e-mail attachments have a number bubble next to their e-mail thread display field?

E-mail attachments are indicated by an icon next to the e-mail thread display field. This icon serves as a visual cue to users, helping them easily identify messages that include attachments without the need for a numerical indication. This design choice is aimed at enhancing user experience and making it clearer that there is additional content associated with the message.

In contrast, the other choices imply that attachments are represented by either a number bubble, vary in indication across different views, or lack any form of indication altogether, which does not accurately reflect how attachments are typically displayed in most email clients.