You are an administrator of a large corporation with 18 sites. You have 5,500 users through- out the United States. You are currently running Windows 7 and 8 with three types of desk- top computers and three types of laptops. You need to deploy Windows 8.1 to about half of the computers with a small team of administrators over the next few months. How should you proceed to update these computers with the least amount of administrative effort when you perform the actual deployments?