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: Jennifer is playing tennis if and only if it is overcast. William is not climbing a mountain. For all z, if z makes tea, then z is playing tennis. William is climbing a mountain if and only if it is overcast.
If Jennifer plays tennis, then it is overcast can be inferred via the biconditional elimination rule. If William climbs a mountain, then it is overcast can be inferred via the biconditional elimination rule. If it is overcast, then Jennifer is playing tennis can be inferred via the biconditional elimination rule. If it is overcast, then William is climbing a mountain can be inferred via the biconditional elimination rule. It is not overcast can be inferred via the biconditional elimination rule.