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 cold, then David is a lawyer. It is not overcast. It is cold. It is overcast or it is cloudy.
David is a lawyer can be inferred via the modus ponens rule. It is cloudy can be inferred via the disjunctive syllogism rule. It is not overcast and it is cold can be inferred via the conjunction rule. It is cold and it is not overcast can be inferred via the conjunction rule.