A trustworthy non-mudallis might have met his teacher, but no prior hearing is independently established. Which contrast accurately states Muslim’s and Nawawī’s arguments?

Both declare it conclusively connected and free of all other defects
Muslim universally requires the formula ḥaddathanā for every ʿan-report
Muslim does not equate an undocumented meeting with proven disconnection; Nawawī distinguishes stronger probability from bare possibility and favors established meeting
Nawawī treats every trustworthy solitary report as mutawātir