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 y, y is happy or y is a scientist. There is at least one y for which y will work. For all y, if y were happy, then y is a server. For all y, if y were a scientist, then y is a server.
For all y, y is a server can be inferred via the universal disjunction elimination rule.