Which access control principle limits a user's access to the specific information required to perform the currently assigned task?

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Answer the following statement true (T) or false (F)

Which of the following does not occur when sending a message using a digital envelope?

(a) The message is encrypted using a symmetric secret key. (b) The secret key is encrypted using public-key encryption. (c) A courier is used to transmit the symmetric secret keys between parties. (d) All of the above occur when sending a message using a digital envelope.