A foreign gene is incorporated into a virus, creating a recombinant virus. The virus is now allowed to infect certain cells, with the hope that the foreign gene carried by the virus will be incorporated into the DNA of the cells. Which of the following is true?
A) The virus is the cloning vector. B) The cells are the cloning vectors. C) The virus is the cloning host. D) Both "a" and "c" are correct. E) Both "b" and "c" are correct.