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 reading a book or it is snowing. Karen is reading a book or David is driving a car. Michael is a police officer if and only if David is driving a car. It is snowing if and only if Michael is a police officer.
David is driving a car or it is snowing can be inferred via the resolution rule. If Michael were a police officer, then David is driving a car can be inferred via the biconditional elimination rule. If it snows, then Michael is a police officer can be inferred via the biconditional elimination rule. If David drives a car, then Michael is a police officer can be inferred via the biconditional elimination rule. If Michael were a police officer, then it is snowing can be inferred via the biconditional elimination rule.