Which activity is focused on preventing enemy intelligence from succeeding?

The focus of defensive activities is to protect sensitive information and counteract enemy intelligence efforts. This encompasses a range of measures designed to prevent unauthorized access to vital data, thwart espionage attempts, and maintain the integrity of information systems. By implementing strategies such as conducting security awareness training, monitoring for suspicious behavior, and using security technologies, defensive activities are specifically aimed at ensuring that adversaries are unable to successfully gather intelligence.

In contrast, espionage is the act of gathering information clandestinely and is therefore aimed at obtaining intelligence rather than preventing it. Offensive activities include actions taken to gather intelligence or disrupt an adversary's capabilities, putting them at odds with the goal of preventing enemy intelligence successes. Intelligence integration, while important for synthesizing diverse data for operational effectiveness, does not primarily focus on countering enemy intelligence efforts. Thus, defensive activities are distinctly positioned as the activity that aims to thwart enemy intelligence operations.