Compare the hardware requirements of the NameNode with that of the DataNodes in a Hadoop
cluster:

A.
The NameNode requires more memory and no disk drives.

B.
The NameNode requires more memory but less disk capacity.

C.
The NameNode and DataNodes should have the same hardware configuration.

D.
The NameNode requires less memory and fewer number of disk drives than the DataNodes.

E.
The NameNode requires more memory and requires greater disk capacity than the DataNodes.

Explanation:
http://www.atlantbh.com/how-to-build-optimal-hadoop-cluster/ (Hardware
requirements, basic hardware recommendation)