Universal Containers has seven orgs in different regions.

The correct selection is C. Unlocked packages fit a global-plus-regional model because UC can publish centrally governed global packages and let each region build dependent extension packages. This preserves a common baseline while allowing approved local customization without forcing regional code into the central package. From a system-design perspective, the decision should minimize unnecessary coupling while preserving clear ownership, scalability, governance, and extensibility. Salesforce architecture is strongest when boundaries reflect real business and technical responsibilities instead of using organizational convenience as the primary design driver. The rejected designs either centralize too much, fragment without justification, or use a mechanism that does not create the required architectural contract between systems or teams. For this scenario, the decisive point is therefore the platform behavior represented by the selected option (C. Use unlocked packages to deploy the global code and allow each country to create its customized unlocked package extensions.). Applying that rule consistently keeps the implementation aligned with Salesforce-supported lifecycle practices and makes the resulting change easier to review, validate, and operate across environments.

Study Guide reference: System Design — org strategy; modular architecture; integration topology; data ownership; enterprise governance; scalability.