Final answer:
The true statement about Windows Server 2008 R2 is that it is the first server edition to include the Hyper-V virtualization platform, and the OS is available only in 64-bit editions without the Aero Glass interface.
Step-by-step explanation:
When looking at Windows Server 2008 R2, it is important to note that the correct statement among the options provided is that Windows Server 2008 R2 is the first server edition to include the Hyper-V virtualization platform.
Regarding the other statements: Windows Server 2008 R2 actually supports more than 64 GB of RAM, with the exact amount depending on the edition used. For example, the Enterprise and Datacenter editions can support up to 2 TB of RAM. Furthermore, Windows Server 2008 R2 is available only in 64-bit editions; there is no 32-bit version. Lastly, while Aero Glass was a new feature in Windows Vista and included in Windows 7, the graphical user interface for Windows Server 2008 R2 was not focused on Aero Glass aesthetics but rather on providing a stable and secure server environment.