The bacterium, Corynebacterium diphtheriae, the causative agent of diphtheria, produces a toxin that damages epithelial tissue. A protein called DtxR bonds to iron and silences the transcription of the toxin gene. In the absence of iron, DtxR is inactive, and the cell begins expressing the toxin. Which of the following statements is correct? Question 10 options: DtxR is a positive inducer of transcription DtxR is a repressor which blocks RNA polymerase from binding to the promoter when is present the toxin regulates its own production RNA polymerase can bind to the promoter and transcribe when iron is present