Which of the following is the primary weakness of symmetric-key encryption?

Which of the following is the primary weakness of symmetric-key encryption?
A . Data encrypted using symmetric-key encryption is subject to corruption during transport.
B . Symmetric-key encryption operates slower than asymmetric-key encryption.
C . Symmetric-key encryption does not provide the service of data confidentiality.
D . Keys created using symmetric-key encryption are difficult to distribute securely.

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Answer: D