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Which of the following is the most important reason why it is virtually impossible for one entity in a blockchain network to unilaterally alter a

Which of the following is the most important reason why it is virtually impossible for one entity in a blockchain network to unilaterally alter a document after it has been recorded and validated in a new block of transactions?

a. The use of a nonce to validate each block

b. The existence of multiple copies of the blockchain on many different computers

c. Digital signatures

d. Digital certificate

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