Centralized client entry and request routing is correct because an API gateway gives you a single, unified entry point for clients and it routes incoming requests to the appropriate backend services.

An API gateway implements cross cutting concerns such as authentication and authorization, SSL termination, rate limiting, and request routing so that individual microservices do not need to duplicate these responsibilities. By acting as the central entry point the gateway decouples clients from the internal service topology and it can also provide API versioning and request aggregation to simplify client interactions.

Data caching is not the primary benefit. A gateway can optionally perform caching but caching is a specific feature and not the main architectural reason to add a gateway.

Cloud Load Balancing is not correct because load balancing is focused on distributing traffic across instances and is often handled by cloud load balancers or service mesh components. The gateway focuses on routing and API concerns rather than replacing a dedicated load balancer.

Data transformation is not the primary benefit even though some gateways can transform payloads or mediate protocols. Transformation is a useful feature but it is a secondary capability compared to providing a centralized client entry and routing layer.

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