Answer: b)System Integrity
Explanation: System integrity is the function that assure that with the change or alteration in the system , the functioning does not gets interrupted. It does not let the unauthorized access to happen which will effect the system function with insecurity .
Other options are incorrect because confidentiality is the maintaining the security , availability is the presence of the function or data and data integrity is no change in the data security while unauthorized access.Thus, the correct option is option(b).