1. Which of the following explains the events in late stage of phage T7 infection in E. coli? (A) There is a high level of transcription of host genes. (B) Host polymerase holoenzyme directs transcription. (C) The host core enzyme participates in transcription in conjunction with the phage-encoded specific sigma factor. (D) Phage T7-specific core polymerase participates in transcription in conjunction with the host sigma factor. (E) The T7 phage -specific RNA polymerase specifies transcription of genes.