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: It is not sunny. It is sunny if and only if it is cold. Jessica is working if and only if it is cold.
If it is sunny, then it is cold can be inferred via the biconditional elimination rule. If Jessica works, then it is cold can be inferred via the biconditional elimination rule. If it is cold, then it is sunny can be inferred via the biconditional elimination rule. If it is cold, then Jessica is working can be inferred via the biconditional elimination rule. It is not cold can be inferred via the biconditional elimination rule.