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 windy, then it is late. If it is late, then it is windy. If it is windy, then it is sunny. Jennifer is not sad. It is sunny if and only if Jennifer is sad.
If it is late, then it is sunny can be inferred via the transitivity rule. It is windy if and only if it is late can be inferred via the biconditional introduction rule. It is late if and only if it is windy can be inferred via the biconditional introduction rule. If it is sunny, then Jennifer is sad can be inferred via the biconditional elimination rule. If Jennifer were sad, then it is sunny can be inferred via the biconditional elimination rule. It is not sunny can be inferred via the biconditional elimination rule.