Implementing automated inventory management software is the best choice because it allows for real-time tracking and updates of network assets, reduces human error, and provides detailed reports that can be used for compliance and auditing. Manual tracking, although feasible, is labor-intensive and prone to error especially in large organizations. Spreadsheet-based methods, while simple, may not provide real-time updates and are not scalable for larger networks. Asset tags are useful for physical identification but do not offer the comprehensive management features such as version tracking or warranty management that automated software provides.