A recombinant plasmid was constructed with several restriction enzyme sites and an ampicillin resistance marker.This recombinant was used to transform a host bacteria that also has the ampicillin resistant gene.Which of the following statements is true regarding this experiment?

A)All transformed bacteria will grow on a plate containing ampicillin.
B)All untransformed bacteria will grow on a plate containing ampicillin.
C)It will be difficult to screen for a colony containing a plasmid.
D)A bacterial host that is ampicillin-sensitive should be used for the screening.
E)All of the choices are true.