I question that there are even three. The FBI's assessment with "high confidence" is pure BS; the FBI could not have honestly made such an assessment given that they were never permitted to do forensic examination of the server(s).
So in what did they have "high confidence?" Nothing more than that the assessment of the CIA and NSA was probably correct.
It's really a scary interesting read. https://www.dni.gov/files/documents/ICA_2017_01.pdf