The correct option is Statement of work.

The Statement of work is a formal and detailed document created to define the exact tasks and deliverables required to carry out an authorized change. It specifies scope, acceptance criteria, timelines, roles and responsibilities, and deliverables so that the change can be executed and measured against agreed outcomes.

The Statement of work is used in procurement and project governance and it serves as the contract level description of what must be delivered and when, which is why it is the appropriate document when formal authorization is enforced.

Technical design document is focused on architecture and implementation details and it does not serve as the contract level list of tasks and deliverables that a SOW provides. It may feed into the SOW but it is not the formal SOW itself.

Change request record in the ITSM system captures the request, approvals, scheduling and metadata about the change but it does not contain the full, detailed breakdown of tasks and deliverables. It often references the SOW or other planning documents rather than replacing them.

Quality assurance and test plan describes how verification and validation will be performed and it focuses on test cases and acceptance criteria. It does not define the comprehensive set of tasks and deliverables required to implement the change.

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