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: James is not happy. It is sunny or Karen is a soldier. It is sunny if and only if James is happy.
If it is sunny, then James is happy can be inferred via the biconditional elimination rule. If James were happy, then it is sunny can be inferred via the biconditional elimination rule. It is not sunny can be inferred via the biconditional elimination rule.