What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Name the inference rule being used: If it is cloudy, then Barbara is listening to a song. For all x_12, if x_12 listens to a song, then x_12 is working. If Barbara works, then it is cloudy.
If Barbara works, then Barbara is listening to a song can be inferred via the transitivity rule.