An application is built as a single deployable unit that contains all its business features and runs in one process behind a load balancer. When one feature needs to call another, the call is an in-memory function invocation rather than a network request. The architectural pattern that matches this description is:

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A monolithic application, since the entire system runs as a single deployed unit and internal calls happen inside the same process without any extra network overhead.

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A microservices architecture, because each business feature is isolated from the others and can be replaced independently without affecting the rest of the system.

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A serverless deployment, since the entire application is hosted within a single cloud-managed runtime that scales automatically with the volume of incoming user traffic.

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An event-driven architecture, because the load balancer publishes incoming requests as events that the internal features then consume in order through a shared queue.

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