A 998 offer that allowed the plaintiff to choose between two options, one of which was definite and calculable ($65,000 for a dismissal) and the other which was ambiguous (because it dealt only with categories of damages without quantifying them, thus leaving the offer dependent on post offer proof of disputed items) was sufficient to shift costs and fees in this Song-Beverly Act case when the plaintiff declined the offer and recovered less than the definite and calculable alternative. An offer that merely says the amount the court determines the plaintiff is entitled to is not a valid 998 offer. However, disagreeing with Gorobets v. Jaguar Land Rover North America, LLC (2024) 105 Cal.App.5th 913, this decision holds that simultaneous alternative 998 offers may be effective to shift costs if rejected. There is no difficulty in determining whether the judgment is more favorable than the offers if each offer is judged separately, and the judgment is less than the more favorable (or here, the only enforceable) offer.