The correct answer is: B. A plain text mail
A plain text mail is a type of email that does not contain any formatting or images. It is simply a text message that is sent from one email address to another. Plain text mails cannot spread viruses because they do not contain any executable code.
An email with attachment is a type of email that contains a file that is attached to the message. The file can be a document, a spreadsheet, a presentation, or any other type of file. If the file is infected with a virus, the virus can be spread to the recipient’s computer when they open the file.
Downloading files over the web is a process of transferring files from a remote server to your computer. The files can be anything from software programs to music files. If the file is infected with a virus, the virus can be spread to your computer when you download the file.
Therefore, the only option that cannot spread a virus is a plain text mail.