In Order to Transcribe the Late Structure Genes Found on the Left

In order to transcribe the late structure genes found on the left hand side of the $\lambda$ phage genome,which of the following must occur?

A) The phage genome must be integrated into the host chromosome.
B) The phage genome must be linear.
C) The phage genome must be circularized
D) The phage genome must be replicated into many copies.
E) The phage genome must be ligated into concatmers.