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: David is not a police officer or it is windy. Linda is a mechanic if and only if it is windy. David is a police officer or it is cold. If it is cold, then Linda is a mechanic. It is sunny.
It is cold or it is windy can be inferred via the resolution rule. If Linda were a mechanic, then it is windy can be inferred via the biconditional elimination rule. If it is windy, then Linda is a mechanic can be inferred via the biconditional elimination rule.