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: Karen is not climbing a mountain. It is not windy. It is windy if and only if Robert is listening to a song. If Elisabeth drives a car, then Karen is climbing a mountain.
Elisabeth is not driving a car can be inferred via the modus tollens rule. Karen is not climbing a mountain and it is not windy can be inferred via the conjunction rule. It is not windy and Karen is not climbing a mountain can be inferred via the conjunction rule. If it is windy, then Robert is listening to a song can be inferred via the biconditional elimination rule. If Robert listens to a song, then it is windy can be inferred via the biconditional elimination rule. Robert is not listening to a song can be inferred via the biconditional elimination rule.