Which of the following describes a major difference between the positive-strand RNA viruses and negative-strand RNA viruses?

A) Only positive-strand viruses must package their polymerase in their virion.
B) Only negative-strand viruses must package their polymerase in their virion.
C) Only positive-strand viruses must encode a polymerase in their genome.
D) Only negative-strand viruses must encode a polymerase in their genome.
E) Both kinds of RNA viruses both encode and package a polymerase.