What model of the Exadata Database Machine come with 3 Infiniband switches?

A.
Quarter Rack of X2-2

B.
Half Rack of X2-2

C.
Full Rack of X2-2

D.
All models

Explanation:

http://en.wikipedia.org/wiki/Oracle_Exadata
http://jde.fors.ru/portal/page?_pageid=105,260779&_dad=portal&_schema=PORTAL