Which of the following best describes link encryption? A. Data is encrypted at the point of origin and is decrypted at the point of destination. B. The message is decrypted and re-encrypted as it passes through each successive node using a key common to the two nodes. C. The KDC shares a user-unique key with each user. D. It requires a session key that the KDC shares between the originator and the final destination. Solution B. With link encryption, the message is decrypted and re-encrypted as it passes through each successive node using a key common to the two nodes. Answers A, C, and D are incorrect because they all describe end-to-end encryption.