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: For all x_10, x_10 will not drink water or x_10 is poor. For all x_10, x_10 will drink water or x_10 will drive a car. For all x_10, x_10 will drive a car if and only if x_10 will climb a mountain. There is at least one x_10 for which x_10 will not climb a mountain.
For all x_10, x_10 will drive a car or x_10 is poor can be inferred via the universal resolution rule. For all x_10, if x_10 drives a car, then x_10 is climbing a mountain can be inferred via the universal biconditional elimination rule. For all x_10, if x_10 climbs a mountain, then x_10 is driving a car can be inferred via the universal biconditional elimination rule. There is at least one x_10 for which x_10 will not drive a car can be inferred via the existential biconditional elimination rule.