Deploying Multiple Computers

You are an administrator responsible for deploying 340 clients running Windows 8.1. These clients contain a mix of mobile computers and desktop computers, 32-bit computers and 64-bit computers. They will be distributed throughout a campus of three buildings and five subnets. Each subnet starts from a single DHCP server located on the server subnet. You have a newly installed WDS server (located on the server subnet) used to deploy Windows. You also have several older computers that do not support PXE. How many images do you need to deploy Windows to these clients and why do you need each of these images?