This question evaluates skills in personalized ad delivery, including user-level modeling, metric design, experimental and causal inference techniques, and decision policies within a Machine Learning domain.

You operate a consumer feed with a single ad opportunity per request and three possible ad categories (A, B, C). You need to decide, for each impression, which category to show to maximize business value while maintaining user experience.
Design an approach to personalize the delivery of the three ad categories. Specifically:
Assume you can log propensities and outcomes and you can run controlled experiments.
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