Universal Containers (UC) is on the Unlimited Edition of Salesforce orgs.

The correct selection is D. UC is consuming two Full sandboxes even though one is no longer active. Retiring the obsolete performance-test Full sandbox releases scarce sandbox entitlement capacity and is the most direct administrative correction before opening support cases or changing the useful Partial Copy environment. From a planning perspective, the architect must reduce uncertainty before execution by defining ownership, governance, environment purpose, prioritization, and measurable acceptance criteria. Decisions should be repeatable and visible across teams so delivery capacity, risk, and stakeholder expectations remain aligned throughout the lifecycle. The alternatives are weaker because they address a symptom rather than establishing the governance or environment decision required before implementation begins. For this scenario, the decisive point is therefore the platform behavior represented by the selected option (D. Delete the full sandbox used for performance testing.). 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: Planning — governance; agile planning; environment strategy; backlog prioritization; sandbox strategy; stakeholder alignment.