A mixture of S aureus and the enteric bacteria E. coli was placed onto the skin of the fingertips ...

A mixture of S
 
  aureus and the enteric bacteria E. coli was placed onto the skin of the fingertips of a volunteer. The volunteer immediately touched one of their inoculated fingertips to nutrient agar plate 1 and then waited 30 minutes and touched a different inoculated finger to nutrient agar plate 2 . After incubating the plates overnight, what pattern of growth would you expect to see on the plates?
 
  A. Both E. coli and S. aureus grew on both plates.
  B. Plate 1 grew both, while plate 2 grew only S. aureus.
  C. Plate 1 grew both, while plate 2 grew only E. coli.
  D. Plate 1 grew only S. aureus, while plate 2 grew both.
  E. Plate 1 grew only E. coli, while plate 2 grew both.