An Experimenter Rings a Bell, and Then an Animal Sits

An experimenter rings a bell, and then an animal sits up and salivates; then the experimenter delivers food. This could be an example of either classical or operant conditioning. To decide which it is, we need to know

A) whether the animal eats the food.
B) whether the experimenter delivers food after every bell, or only after the animal sits up.
C) whether the animal sits up immediately after the bell, or whether there is a delay.
D) whether the animal would be given a shock if it failed to sit up.