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 it is overcast, then James is driving a car. James is driving a car if and only if it is overcast. If James drives a car, then it is overcast.
It is overcast if and only if James is driving a car can be inferred via the biconditional introduction rule. James is driving a car if and only if it is overcast can be inferred via the biconditional introduction rule. If James drives a car, then it is overcast can be inferred via the biconditional elimination rule. If it is overcast, then James is driving a car can be inferred via the biconditional elimination rule.