Which is the sound statement on certainty in mutawatir and solitary reports?

Comprehensive Review and Applied Reasoning in Usul al-Fiqh

• Acting on solitary reports gives them the certainty of mass transmission
• Certainty in mutawatir and authority of solitary reports are distinct issues
• Mashhur and solitary reports cannot have any legal authority
• Mutawatir certainty depends only on a narrator’s legal expertise