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_8, x_8 will not work or x_8 will climb a mountain. For all x_8, if x_8 were an astronaut, then x_8 is working. For all x_8, x_8 is not a janitor or x_8 will drink water. For all x_8, x_8 is a janitor or x_8 is an astronaut. For all x_8, if x_8 drinks water, then x_8 is working.
For all x_8, x_8 is an astronaut or x_8 will drink water can be inferred via the universal resolution rule.