Investigate scheduled activities, such as extract refreshes or subscriptions, occurring during those times When high CPU usage is observed at specific times of the day, the best initial action is to investigate scheduled server activities, such as extract refreshes or report subscriptions, that might be occurring during those times. Understanding the cause of the CPU spikes can inform more targeted actions, such as rescheduling these activities or optimizing them for better re-source usage. Option A is incorrect because upgrading hardware should be considered only after assessing and addressing the causes of high CPU usage within the current setup. Option C is incorrect as limiting user access is a reactive measure that does not address the root cause of the high CPU usage. Option D is incorrect because ignoring the pattern might lead to overlooking potential performance issues that could impact server stability and user experience.