The Term Antigenic Drift Refers to

The term antigenic drift refers to

A) mutation during genome replication resulting in minor antigenic change and relatively mild influenza outbreaks every 1 to 3 years.
B) reassortment of the segmented viral genome during co-infection in nonhuman animals, resulting in major antigenic change and periodic worldwide outbreaks.
C) what happens when human virus infects a cell at the same time as an animal influenza virus.
D) All of the above are correct.