The correct answer is C. HDFS Block is both the logical and physical representation of data.
A block is the unit of storage in HDFS. It is a contiguous sequence of bytes that is stored on a single node. The size of a block is configurable, but it is typically 128MB.
Blocks are the logical representation of data in HDFS. When a file is stored in HDFS, it is split into blocks. The blocks are then stored on different nodes in the cluster. This allows for fault tolerance and scalability.
Blocks are also the physical representation of data in HDFS. When a file is read from HDFS, the blocks are read from the nodes in the cluster. This allows for high performance.
Option A is incorrect because blocks are not the logical representation of data. The logical representation of data in HDFS is a file.
Option B is incorrect because blocks are not the physical representation of data. The physical representation of data in HDFS is a block.
Option D is incorrect because blocks are both the logical and physical representation of data in HDFS.