Once the Autoinducer Excreted by Vibrio Fischeri Reaches a Critical

Once the autoinducer excreted by Vibrio fischeri reaches a critical concentration,it is able to diffuse back into the cell.What is its next action?

A) Bind to the bacterial luciferase to produce luminescence.
B) Inactivate a transcriptional repressor to allow transcription of the lux genes.
C) Bind to a transcriptional activator protein to activate transcription of the lux genes.
D) Be cleaved by a protease to produce luminescence.
E) Bind to the promoter to enhance transcription of the lux genes.