Which of the following is an advantage of using link encryption? a. Individual nodes in the network

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Which of the following is an advantage of using link encryption?

a. Individual nodes in the network do not have to be protected

b. The exposure that results from compromise of an encryption key is restricted to a single user to whom the key applies

c. It protects messages against traffic analysis

d. The costs of using link encryption can be easily assigned to the users of the network

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