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Which of the following is the most important reason why it is virtually impossible for one...

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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