The trp operon contains five genes: trpE, trpD, trpC, trpB, and trpA. These five genes code for components that produce three enzymes that catalyze the biosynthesis of tryptophan. The trpL region is the leader region, which helps regulate transcription once RNA polymerase has initiated transcription. Determine which events lead to an increase in transcription. The trp operon is transcribed when:a. the trp repressor is active. b. the trp repressor dissociates from DNA. c. trp is present at low concentrations inside the cell. d. trp binds to the repressor. e. the trp repressor is bound to the operator.