A statement of work (SOW) has been heavily revised by the stakeholders. Which of the following should be implemented to make it easier to determine how many times the document has been revised?

Version control systems are designed to track changes to documents over time, automatically assigning new versions or revisions and often maintaining a history of who made which changes and when. This makes it straightforward to count revisions and compare different versions of the SOW.

While a document revision date indicates when the last change occurred, it does not automatically track the total number of revisions or provide a historical log of all changes made.

Approval signatures indicate agreement on a specific version but do not inherently track the total number of revisions or provide a system for managing document iterations.

A change request is a formal proposal for altering a document or project element, but it is a process for initiating changes, not a system for tracking the numerical history of document revisions itself.