How Does the Cro Protein From $\lambda$ Phage Help to Establish a Lytic Infection?
A)It Inhibits the Establish

How does the cro protein from $\lambda$ phage help to establish a lytic infection?

A) It inhibits the integrase enzyme.
B) It activates the excision enzyme.
C) It binds to O_L1 and blocks transcription from P_L
D) It binds to O_R1 and blocks transcription from P_R
E) It binds to O_R3 and blocks transcription from P_RM.