All of the listed responses are correct.

In bacteria, proteins called transcription factors enhance the affinity of RNA polymerase to the promoter sites of genes.

In bacteria, transcription of a gene is initiated when the RNA polymerase by itself recognizes and binds to the promoter of the gene.

The initiation of gene transcription in eukaryotes requires the binding of proteins called transcription factors to the TATA box in the promoter region of a gene.