The correct selection is A. Scope creep across multiple projects and vendors requires formal change-management governance. A Change Manager establishes consistent intake, impact assessment, approval, communication, and cross-project coordination rather than leaving enterprise scope control to individual Scrum or release roles. 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 rejected options do not resolve the planning problem at its source; they either add process overhead or make assumptions that leave ownership and delivery risk unclear. For this scenario, the decisive point is therefore the platform behavior represented by the selected option (A. Change managers). 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.