________ ensures that data cannot be altered in a blockchain.

________ ensures that data cannot be altered in a blockchain.

  1. a) Consensus mechanism
  2. b) Smart contract
  3. c) Immutability
  4. d) Distributed ledger

From the BCS Technical Cadre (ICT) October 2025 – 49th BCS Written (Special) (BPSC) exam, question 3 of 106.

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