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_1, if x_1 were a mechanic, then x_1 is climbing a mountain. For all x_1, x_1 will drive a car. For all x_1, x_1 is a mechanic.
For all x_1, x_1 will climb a mountain can be inferred via the universal modus ponens rule. For all x_1, x_1 will drive a car and x_1 is a mechanic can be inferred via the universal conjunction rule. For all x_1, x_1 is a mechanic and x_1 will drive a car can be inferred via the universal conjunction rule.