What is true about Einstein engagement frequency (EEF). Select 3

What is true about Einstein engagement frequency (EEF). Select 3
A . EEF uses only commercial send data not transactional
B . The model uses data available only in your account
C . Used to determine correct no of mails to be send so that there are less unsubscribes due to email fatigue. email fatigue.
D . It uses last ISO days engagement data

Answer: A,B,C