When First Training Your Dog, You Say, "Good Dog" and Give

When first training your dog, you say, "Good dog" and give her a doggie treat every time she lies down the way you want her to. After several learning trials, your dog learns that there is an association between the phrase "Good dog" and the appearance of a doggie treat and she will become excited and salivate each time you use this phrase. In fact, this same phrase can be used without doggie treats to reinforce your dog for learning other tricks. In this example, the phrase "Good dog" is both a:

A) primary reinforcer and a secondary reinforcer.
B) primary reinforcer and a conditioned stimulus.
C) secondary reinforcer and a conditioned stimulus.
D) positive reinforcer and a negative reinforcer.