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?

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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

Answer: D