Availability & Confidentiality are the two aspects of the CIA that have been violated.
The main goals of the CIA are to conduct covert actions and gather, assess, and transmit the message.
In this as the message was meant to be sent to bob, but the message was being received by Trudy who after hearing and understanding it she deletes it.
This means that as Bob was not available he was it was his message that was taken and the confidentiality was also broken as the message was for bob and alter the message should be given but was rather deleted.
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