Q: Blockchain which is popularly known as  

Answer: C

Public Blockchain.

The term "for the people, by the people, and of the people" is often used to describe public blockchains. Public blockchains like Bitcoin and Ethereum are decentralized networks that are open to anyone, without requiring permission or access controls. Anyone can participate in the network by running a node, validating transactions, and contributing to the security and consensus of the network. This makes public blockchains highly transparent, censorship-resistant, and trustworthy, with no central authority controlling the network.

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