Which of the following indicates that an email has an attachment?

The presence of a paperclip icon next to an email is a universal visual indicator that indicates the email has one or more attachments. This icon serves as a quick reference for recipients, signaling that there is additional content accompanying the email message itself. Attachments can include various file types, such as documents, images, or other types of files that the recipient can download or view.

While other options might enhance the email's clarity or organization, they do not specifically denote the presence of attachments. For instance, a bold subject line may draw attention to the email's content but does not indicate whether attachments are included. Similarly, a highlighted sender's name might help identify the email's origin but provides no information regarding attachments. A separate attachments section might inform the recipient that attachments exist, but it isn’t a visual cue that shows the presence of attachments directly next to the email itself. Therefore, the paperclip icon is the clearest and most recognized symbol indicating that an email includes attachments.