Which of the following is the MOST important security objective when applying cryptography to control messages that tell an ICS how much electrical power to output?

Which of the following is the MOST important security objective when applying cryptography to control messages that tell an ICS how much electrical power to output?
A . Importing the availability of messages
B . Ensuring non-repudiation of messages
C . Enforcing protocol conformance for messages
D . Assuring the integrity of messages

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Answer: D