Which of the following is ensured by the concept of availability in information system security?

Which of the following is ensured by the concept of availability in information system security?
A . Data modifications are not made by an unauthorized user or process.
B . The intentional or unintentional unauthorized disclosure of a message or important document contents is prevented.
C . The systems are up and running when they are needed.
D . Unauthorized modifications are not made by authorized users.

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Answer: C