The director of a laboratory in charge of making the flu vaccine for the upcoming season is planning her production strategy. She must consider the phenomenon of reassortment, in which A) two different viruses contribute genome segments to a reassorted genome that remains segmented. B)t here is antigenic shift C)t here is antigenic drift. D)two different viruses contribute genetic material to form a recombinant molecule. E)genes within a genomic segment of a virus undergo a fast mutation rate in the presence of another virus..