CS modules is for

CS modules is for
A . Isolated Business Logic (Actions) or Core Widgets (blocks), to manage complexity, composition or to have its own lifecycle.
B . Logic to Synchronize data in CS’s with an external system. Isolating this logic makes the CS completely system agnostic and it’s easier to decouple or replace the external system.
C . Technical wrapper to expose an API to External consumers, keeping core services system agnostic and supporting multiple versions of the API.
D . A BL becomes a Calculation Engine if it performs complex calculations, (e.g. an invoice calculation engine or an insurance simulator). Engines are usually subject to versions.
E . Reusable Core Services with public entities, actions, and blocks.

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Answer: E