Which editions of Pardot provides Buisness Units and Einstein functionalities

Which editions of Pardot provides Buisness Units and Einstein functionalities
A . All
B . Pardot Plus Edition and Pardot Advanced Edition
C . Only Pardot Advanced Edition and it includes unlimited Buisness Units
D . Only Pardot Advanced Edition and it includes 2 Buisness Units, then each subsequent costs 2 000$/month

Answer: D