Which of the following is known to be TRUE about dog owners and their dogs? A) Dog owners have fewer skin microbes than those who don't own dogs. B) Dog owners have more skin microbes than those who don't own dogs. C) Skin microbes are more common between dog owners and their own dogs than between dog owners and other dogs. D) Skin microbes are similar between dog owners and dogs in general, with no difference in similarity when dogs and their owners are compared with other human-dog pairs.