Derek is frustrated that his one-and-a-half year old dog does not let him know when he needs to go outside to urinate. sometimes he comes home to find a mess near the door. which training method is most likely to be successful?

a. derek takes his dog outside on a fixed schedule and gives him a treat when they return to the house, whether he urinated or not.
b. derek takes his dog over to the mess, puts the dog’s nose near it so he smells it, and tells him "bad dog, don’t do this again! "
c. if derek comes home and finds a mess by the door, he ignores his dog for an hour.
d. derek takes his dog outside on a fixed schedule and promptly gives him a treat for urinating outside.