What Is a Major Difference Between the General and Regulatory

What is a major difference between the general and regulatory transcription factors?

A) General transcription factors only regulate the housekeeping genes while regulatory transcription factors control all of the other genes.
B) General transcription factors are essential for any transcription for all genes while regulatory transcription factors regulate transcription of specific genes.
C) General transcription factors act as heterodimers while regulatory transcription factors act as monomers.
D) General transcription factors regulate basal genes while regulatory transcription factors control all of the other genes.