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: James is taking a plane or it is late. Barbara is not bored. Barbara is bored if and only if James is taking a plane.
If Barbara were bored, then James is taking a plane can be inferred via the biconditional elimination rule. If James takes a plane, then Barbara is bored can be inferred via the biconditional elimination rule. James is not taking a plane can be inferred via the biconditional elimination rule.