A cloud engineer is planning the migration of a stateful application that stores session data in memory on each application server. After lift-and-shift to cloud VMs, users in the same session are being randomly routed to different instances and losing their session data. What architectural change would resolve this and align with cloud-native best practices?

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A. Externalize session state to a managed in-memory cache or database (e.g., Redis) so all instances share the same session store. Externalizing session state to a shared cache like Redis allows any application instance to retrieve session data regardless of which instance handled prior requests, making the application stateless and cloud-native. The CompTIA Cloud+ V4 Deployment domain covers workload migrations and system requirements analysis; Cloud Architecture covers resource optimization.

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