1. Which figure implements confidentiality and authentication? AnswerAnswer: a [Reason:] Figure a implements both confidentiality and authentication. 2. Which figure implements confidentiality, authentication and signature? AnswerAnswer: d [Reason:] Figure a implements confidentiality, authentication and signature. 3. The above figure implements authentication and signature only? a) True b) False AnswerAnswer: a [Reason:] The system does not…