You work for an organization that manages an ecommerce site. Your application is deployed behind an external Application Load Balancer. You need to test a new product recommendation algorithm. You plan to use A/B testing to determine the new algorithm’s effect on sales in a randomized way. How should you test this feature?

A. Split traffic between versions using weights. B. Enable the new recommendation feature flag on a single instance. C. Mirror traffic to the new version of your application. D. Use HTTP header-based routing.