Which of the Following Is True About the Interaction with The \lambda

Which of the following is true about the interaction with the $\lambda$ repressor and RNA polymerase at P_RM?

A) Interaction between repressor and polymerase is essential for activation of transcription.
B) Interaction involves region 4 of $\sigma$ -factor.
C) Interaction can be disrupted by the binding of CIII.
D) Interaction between repressor and polymerase is essential for activation of transcription and interaction involves region 4 of $\sigma$ -factor are correct.
E) Interaction between repressor and polymerase is essential for activation of transcription and interaction can be disrupted by the binding of CIII are correct.