APT Vs. Multi Factor

What is the intercept term for the APT model and the Multifactor Models? One of the exams in schweser, it says that the intercept for an APT model is the E® but in the schweser notes, it says it’s the RFR and the intercept for the Multifactor model is the E®. Can someone explain this to me please? Thanks

it is the RFR… however, in the macroeconomic models it is the E® derived from the APT model…

Thanks Chadtap, that’s exactly what it says in the book. A bit confusing, not sure why they had a different explanation in the exams.