There are "promiscuous plasmids," plasmids that can be interchanged between very different bacteria.These often pick up transposons carrying antibiotic resistance.We are in a hospital that has an outbreak of a variety of bacteria carrying resistance to streptomycin,gentamicin,and penicillin.Which of these would not be helpful in determining how this was occurring?

A) Test all the resistant bacteria for a plasmid.
B) See if the same plasmid could be isolated from all resistant bacteria.
C) See if the plasmid isolated from the bacteria conferred resistance to a test bacterium.
D) With restriction mapping,see if the plasmid seemed to contain transposons known to carry resistance to these antibiotics.
E) Test whether the plasmids contained an origin of replication.