After creating a contract for IT contractors, the human resources department changed several clauses. The contract has gone through three revisions. Which of the following processes should the human resources department follow to track revisions?

Version control is the correct process. It is a system that records changes to a file or set of files over time so that you can recall specific versions later. This is crucial for tracking modifications, identifying who made them, and reverting to previous states if necessary, especially in legal documents like contracts. Version validation, version changes, and version updates are not formal processes for managing document revisions. "Version validation" might be part of a larger process but isn't the overarching system. "Version changes" and "version updates" are simply descriptions of actions, not a structured management system.