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: If James were an astronaut, then it is sunny. It is not sunny. Karen is curious if and only if James is an astronaut. If Michael plays a game, then Karen is curious.
James is not an astronaut can be inferred via the modus tollens rule. If Karen were curious, then James is an astronaut can be inferred via the biconditional elimination rule. If James were an astronaut, then Karen is curious can be inferred via the biconditional elimination rule.