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How does the HDFS architecture provide redundancy?

How does the HDFS architecture provide redundancy?

PrepAway - Latest Free Exam Questions & Answers

A.
Storing multiple replicas of data blocks on different DataNodes.

B.
Reliance on RAID at each datanode.

C.
Reliance on SAN devices as a DataNode interface.

D.
DataNodes make copies of their data blocks, and put them on different local disks.

Explanation:
http://bradhedlund.com/2011/09/10/understanding-hadoop-clusters-and-the-network/
(writing files to HDFS)

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