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 a bartender or it is snowing. Karen is not a bartender. Jessica is sad.
It is snowing can be inferred via the disjunctive syllogism rule. Karen is not a bartender and Jessica is sad can be inferred via the conjunction rule. Jessica is sad and Karen is not a bartender can be inferred via the conjunction rule.