What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Sarah is a cashier if and only if Jennifer is a musician. If Susan were a doctor, then Sarah is a cashier. Jennifer is a musician or Sarah is not a cashier.
If Sarah were a cashier, then Jennifer is a musician. If Sarah were a cashier, then Jennifer is a musician. If Jennifer were a musician, then Sarah is a cashier.