Letra B
The official requirements for installing Windows Server 2012 are as follows:
Processor: Minimum: 1.4 GHz 64-bit Processor
RAM: Minimum: 512 MB
Disk Space: Minimum: 32 GB
Note: Be aware that 32 GB should be considered an absolute minimum value for successful installation. The system partition will need extra space for any of the following circumstances:
If you install the system over a network.
Computers with more than 16 GB of RAM will require more disk space for paging, hibernation, and dump files.
https://blogs.technet.microsoft.com/bobh/2013/02/11/requirements-for-a-fresh-windows-server-2012-installation-part-6-of-19/