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: It is snowing if and only if James is playing tennis. It is not snowing. If James plays tennis, then it is snowing.
James is not playing tennis can be inferred via the modus tollens rule. If it snows, then James is playing tennis can be inferred via the biconditional elimination rule. If James plays tennis, then it is snowing can be inferred via the biconditional elimination rule. James is not playing tennis can be inferred via the biconditional elimination rule.