Question: Which of the options below would be best for security and efficiency? a. Use single-key encryption for the message and double-key encryption for the single

Which of the options below would be best for security and efficiency?

a. Use single-key encryption for the message and double-key encryption for the single key that was used.

b. Use single-key encryption for the message and single-key encryption for the single key that was used.

c. Use single-key encryption for the message and single-key encryption for the sender's private key.

d. Use double-key encryption for the message, and single-key encryption for the sender's private key.

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