What are the key features of UCS?

What are the key features of UCS?
A . 10 Gigabit unified network fabric, virtualization optimization, unified management, service profiles, flexible IO options
B . Gigabit network , virtualization optimization, unified management, service profiles, flexible IO options
C . 10 Gigabit unified network fabric, virtualization hardware, unified management, service profiles, performance IO options
D . 10 Gigabit unified network fabric, virtualization optimization, unified management, service profiles, performance IO options

Answer: A