The correct answer is 'Incorporating an SDN controller with SDV integration capabilities.' Incorporating an SDN controller with SDV features allows for programmable network control and dynamic traffic analysis adjustments based on real-time conditions, thus providing efficient and automated adaptability to changing network demands. It capitalizes on the core advantages of software-defined networking (SDN) and visibility by automating responses to fluctuating conditions. 'Increasing the span port capacity on switches,' while potentially useful, does not provide a dynamic or automated solution. 'Deploying a network-based IDS for additional visibility' is incorrect because while an IDS adds visibility, it does not inherently provide the automation or scalability needed for rapid workload changes. Lastly, 'Utilizing port mirroring to replicate traffic to monitoring systems' is not the best option as it lacks the automated, adaptable response capability integral to SDV and depends on manual configuration.