Which edition of Windows Server provides clustering and hot-add processor capabilities to improve
server uptime?

A.
Windows HPC Server 2008 R2

B.
Windows Server 2008 R2 Standard

C.
Windows Server 2008 R2 Enterprise

D.
Windows Small Business Server 2011 Essentials

Explanation:

Reference:
http://www.nec-itplatform.com/IMG/pdf/white_paper.pdf (page 4)