Introducing recovery control procedures is the best way to address the risk of an outage of the fraud detection system for an online payment processor, because it helps to restore the functionality and availability of the system as quickly and effectively as possible, and to minimize the impact and disruption to the business operations and customers. A fraud detection system is a system that monitors and analyzes the transactions and activities of an online payment processor, and detects and prevents any fraudulent or suspicious behavior, such as identity theft, money laundering, or chargebacks. An outage is a situation where the system is unavailable or inaccessible, due to factors such as technical failure, human error, or malicious attack. An outage of the fraud detection system may have severe consequences for the online payment processor, such as financial losses, reputational damage, customer dissatisfaction, or regulatory penalties. A recovery control procedure is a procedure that defines the steps and actions to be taken to recover the system from an outage, such as identifying the root cause, isolating the affected components, restoring the data and functionality, testing the system, and reporting the incident. Introducing recovery control procedures is the best way to address the risk, as it helps to ensure that the system is back online and operational as soon as possible, and that the risk exposure and impact are reduced and contained. Implementing continuous control monitoring, communicating the risk to management, and documenting a risk response plan are all possible ways to address the risk, but they are not the best way, as they do not directly address the recovery of the system from an outage, and they may not be sufficient or effective to mitigate the risk. References = Risk and Information Systems Control Study Manual, Chapter 5, Section 5.4.1, page 208