A project that involves a complete Windows upgrade for an organization. All of the organization's PCs are being upgraded with Windows 7 and all of the servers are being migrated to Windows 2008. Halfway through the upgrade, Sally is ahead of schedule and under budget when she discovers that there is a compatibility issue with several major printers throughout the organization. With research, she finds that 64-bit drivers are not available for the printers the organization currently owns. Explain the network engineering life cycle and identify the stage in which Sally made her error