A mobile app advertiser is worried about campaign costs and wants more control over their bid price for conversion events. Which bidding or optimization strategy is BEST?

Cost Cap is the best strategy because it allows the advertiser to set a maximum cost per conversion event, providing direct control over bid prices and campaign costs. This ensures that the advertiser will not pay more than their specified cap for each desired action, which directly addresses the concern about campaign costs. Maximum Delivery aims to spend the entire budget and get the most results, but offers no control over the cost per result. App Event Optimization focuses on optimizing for specific in-app events to improve performance, but doesn't inherently provide a cap on the cost per event. Lowest Cost attempts to get the most results for the lowest possible cost, but it doesn't guarantee a specific cost per result and can be less predictable than Cost Cap when strict cost control is needed.