Which case fits the basic definition of majhūl al-ʿayn?

Narrator Anonymity: Wuḥdān, Mubham, Majhūl al-ʿAyn and Mastūr

• The narrator is named, one pupil transmits from him, and adequate authentication is absent
• The narrator is not named at all
• Two pupils and multiple explicit trustworthy endorsements exist
• The hadith is paraphrased