Which Isilon OneFS protection level allows you to withstand two drive failures but no more than
one complete node failure?

A.
N+1

B.
N+2

C.
N+2:1

D.
N+3:1

Explanation:
Reference: http://www.slideshare.net/emcacademics/h10528-hadoop-onemcisilonnas (slide 14,
5th para)