According to the Risk and Information Systems Control documents, the risk practitioner should conclude that no action is required as there was no impact. The fact that there have been no interruptions to business operations despite the increasing hardware failure incidents indicates that the built-in redundancy and fault-tolerant architecture are effective in ensuring continuity.
Options A and C are not necessary in this scenario. A root cause analysis (Option A) might be considered if there were actual interruptions or impact on business operations. However, since there were no interruptions, a root cause analysis may not be immediately required. Similarly, upgrading hardware (Option C) may not be necessary if the existing controls are effectively preventing business disruptions.
References = Risk and Information Systems Control Study Manual