The EBNA-1 protein from the Epstein-Barr virus is being developed to help improve virus vectors.Which of the following describes how this protein could be used?

A) It allows a vector that contains oriP to be maintained as an episome.
B) It stimulates transcription of the transgene incorporated in the vector.
C) It inhibits the intrinsic cellular defenses against the vector.
D) It allows the cell to tolerate the toxic viral proteins.
E) It stimulates cellular DNA replication.