What are the benefits of switching to Hadoop with Isilon OneFS?

A customer is using Hadoop with direct-attached storage. They are concerned about the cost to build and maintain this infrastructure.

What are the benefits of switching to Hadoop with Isilon OneFS?
A . Independent scaling of compute and storage
Multi-protocol access to data
ACL-based permissions
B . Independent scaling of NameNodes
Redundant TaskTracker nodes
Multi-protocol access to data
C . Independent scaling of NameNodes
Multi-protocol access to data
Kerberos authentication
D . Independent scaling of compute and storage
Independent NameNodes
Kerberos authentication