A Transgenic Mouse Is Different from a Knockout Mouse in That

A transgenic mouse is different from a knockout mouse in that:

A) transgenic mice have DNA added to their genome.
B) transgenic mice do not have DNA added to their genome.
C) the transgene is inserted at a random (ectopic) site in the genome.
D) a knockout mouse is more healthy than a transgenic mouse.
E) the knockout mouse is sterile.