You are working for an online travel agency that provides advertising solutions. Your task is to predict the most suitable web banner for a user to view next, with security as a top priority and a model latency requirement of 300ms@p99. Given thousands of banners in the inventory and exploratory analysis showing navigation context as a strong predictor, what is the simplest way to configure the prediction pipeline? Consider the following constraints: the solution must be cost-effective, comply with data protection regulations, and scale efficiently with increasing user traffic. Choose the best option that meets all these requirements.