The correct choice is AWS Business Support. It provides 24x7 access to AWS Cloud Support Engineers by phone, chat, and email and meets the retailer's need for production‑grade, around‑the‑clock support while remaining more cost effective than the top tier.

AWS Business Support includes around the clock phone, chat, and email access to Cloud Support Engineers for production issues and also provides Trusted Advisor best practice checks. This plan is designed for production workloads and gives the required contact methods without the higher recurring cost of an assigned Technical Account Manager.

AWS Enterprise Support provides the most comprehensive coverage and includes a Technical Account Manager and concierge services, but it carries a much higher price and is not the most cost effective choice for the stated requirements.

AWS Developer Support is intended for development and test environments and typically offers business hours email access rather than 24x7 phone and chat access to Cloud Support Engineers, so it does not satisfy the requirement.

AWS Basic Support is limited to account and billing assistance and self‑help resources and does not include enhanced technical support or 24x7 access to Cloud Support Engineers.

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