Which of the following solutions BEST meets all of the architect’s objectives?

A security architect is designing a system to satisfy user demand for reduced transaction time, increased security and message integrity, and improved cryptographic security. The resultant system will be used in an environment with a broad user base where many asynchronous transactions occur every minute and must be publicly verifiable.

Which of the following solutions BEST meets all of the architect’s objectives?
A . An internal key infrastructure that allows users to digitally sign transaction logs
B . An agreement with an entropy-as-a-service provider to increase the amount of randomness in generated keys.
C . A publicly verified hashing algorithm that allows revalidation of message integrity at a future date.
D . An open distributed transaction ledger that requires proof of work to append entries.

Answer: A

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