The service that allows for dynamic adjustment of resources to align with demand levels is Auto Scaling. It ensures that the application can manage increased loads during high traffic periods by automatically scaling resources up or down. This results in maintaining high availability and provides the elasticity needed to handle these work patterns without manual intervention. Edge caching services, such as Amazon CloudFront, optimize content delivery but do not handle infrastructure scaling. Object storage services like Amazon S3 are highly durable and can serve many requests, but they are not responsible for scaling computing resources. DDoS protection like AWS Shield does not address scaling issues but rather focuses on security.