Question: 19. The following figure shows which security services? Source A Destination B @ PR, EXPRO,MPU, EXPU, EXPR, M) PR, E(Pra, M) PU. a. Confidentiality, Digital

19. The following figure shows which security services? Source A Destination B @ PR, EXPRO,MPU, EXPU, EXPR, M) PR, E(Pra, M) PU. a. Confidentiality, Digital signature b. Confidentiality, Digital signature, Message authentication c. Digital signature, Non-repudiation, Confidentiality d. Confidentiality, Message authentication, Availability
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