A Bacterial Sample Was Contaminated with an Unknown Preparation of Vector

Multiple Choice

A bacterial sample was contaminated with an unknown preparation of vector DNA.In order to identify the vector,the bacteria was streaked on a plate and incubated overnight.Examination of the plate revealed at least 120 clear plaques.Which of the following is a plausible conclusion?

A) The vector could be a plasmid.
B) The vector could be a phage.
C) The vector is a Ti.
D) The vector is puc18.
E) The vector is a cosmid.