Answer:
The answer is conditioned response.
Explanation:
In classical conditioning, a conditioned stimulus (the sound of the steps) is associated with an unconditioned stimulus (the food), which provokes a reaction known as conditioned response (salivation).
It's important to recognise that conditioned responses are named so because they are reaction to conditioned stimuli. If the dog salivated at the smell or sight of food, it would actually be an unconditioned response.