Which two releases require physical media to be ordered and received prior to patching or...

 The two releases that require physical media to be ordered and received prior to patching or upgrading Cisco Unified Contact Center Express (UCCX) are the major release and the service update. A major release is a new version of UCCX that introduces significant changes and new features. A service update is a maintenance release that fixes bugs and enhances the functionality of UCCX. Both the major release and the service update are available as ISO images that can be downloaded from the Cisco website or ordered as physical DVDs12

The other options do not require physical media to be ordered and received prior to patching or upgrading UCCX:

Minor release: A minor release is a new version of UCCX that has minor changes and enhancements. A minor release is available as a COP file that can be downloaded from the Cisco website and applied to the UCCX system using the CLI or the web interface12

Engineering special: An engineering special is a patch that addresses a specific issue or customer request. An engineering special is available as a COP file that can be downloaded from the Cisco website and applied to the UCCX system using the CLI or the web interface12

References: 1: Cisco Unified Contact Center Express Install and Upgrade Guide, Release 12.5 (1) - Unified CCX Upgrade [Cisco Unified Contact Center Express] - Cisco 1 2: Cisco Unified Contact Center Express Install and Upgrade Guide, Release 11.6 (2) - Unified CCX Upgrade [Cisco Unified Contact Center Express] - Cisco 2