Which of the following is true about repressor interaction with the gal operator?

A)The repressor binds the operator and causes looping of the DNA.
B)Binding of the operator does not prevent transcription.
C)There is no contact with the major grooves.
D)The repressor binds the operator and causes looping of the DNA and binding of the operator does not prevent transcription are correct.
E)Binding of the operator does not prevent transcription and there is no contact with the major grooves are correct.