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: Sarah is curious. It is sunny or James is an office clerk. Joseph is not listening to a song. If it is sunny, then Joseph is listening to a song.
It is not sunny can be inferred via the modus tollens rule. Sarah is curious and Joseph is not listening to a song can be inferred via the conjunction rule. Joseph is not listening to a song and Sarah is curious can be inferred via the conjunction rule.