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 not raining. Jennifer is an astronaut or Joseph is bored. Jennifer is not an astronaut or Jessica is cooking. Joseph is bored if and only if it is raining.
Joseph is bored or Jessica is cooking can be inferred via the resolution rule. If Joseph were bored, then it is raining can be inferred via the biconditional elimination rule. If it rains, then Joseph is bored can be inferred via the biconditional elimination rule. Joseph is not bored can be inferred via the biconditional elimination rule.