Within the confidentiality, integrity, and availability (CIA) triad, which of the following activities BEST supports...

Ensuring encryption for data in transit is the best activity that supports the concept of confidentiality within the CIA triad, as it protects the data from unauthorized access or interception while it is being transmitted over a network. Encryption is a technique that transforms data into an unreadable form using a secret key, so that only authorized parties who have the key can decrypt and access the data. Encryption standards include AES (Advanced Encryption Standard) and DES (Data Encryption Standard).

References = CISM Review Manual 2022, page 321; CISM Exam Content Outline, Domain 1, Knowledge Statement 1.12; The CIA triad: Definition, components and examples3; CIA Triad - GeeksforGeeks4