Which statement best describes the immutability feature of blockchain?

The statement that best describes the immutability feature of blockchain is that data cannot be changed once recorded. This characteristic is fundamental to blockchain technology, as it ensures that once a piece of information has been added to a block and confirmed by the network, it is permanent and unalterable. This permanence is achieved through cryptographic hashing and the consensus mechanisms used by blockchain networks, which work together to create a decentralized and tamper-resistant ledger.

Immutability enhances trust among participants because everyone can verify that the data has not been modified since its original entry. If changes were allowed, it could lead to discrepancies and manipulation, undermining the credibility of the system. This is why features like the ability to delete or modify data, which are implied in some of the other statements, do not align with the core principle of immutability in blockchain technology.