The best recommendation to address an organization’s need to secure multiple systems with limited IT resources is to perform a vulnerability analysis. A vulnerability analysis is a process of identifying, assessing, and prioritizing the weaknesses or flaws in the systems that could be exploited by threats or risks. A vulnerability analysis helps to determine the level and nature of the exposure and impact of the systems, and to select and implement the appropriate security controls or mitigations. Performing a vulnerability analysis is the best recommendation, as it helps to optimize the use of the limited IT resources, by focusing on the most critical or significant vulnerabilities, and by applying the most effective or efficient security solutions.Performing a vulnerability analysis also helps to improve the security posture and performance of the systems, and to reduce the likelihood and consequences of security incidents or breaches. Applying available security patches, scheduling a penetration test, and conducting a business impact analysis (BIA) are not the best recommendations, as they are either the outputs or the inputs of the vulnerability analysis process, and they do not address the primary need of securing the systems with limited IT resources. References = CRISC Review Manual, 6th Edition, ISACA, 2015, page 217.