An analytical process used to deny adversaries information about our intentions and capabilities is the definition of _____________.

The correct answer is Operations Security (OPSEC). OPSEC is fundamentally about safeguarding sensitive information that might be exploited by adversaries. By analyzing and identifying critical information, organizations can implement measures to deny adversaries insights into their intentions and capabilities. This involves recognizing what information is crucial to protect and employing various methods to ensure that such information is not easily accessible or discernable to those who might use it against the organization.

The essence of OPSEC lies in its proactive approach to information control, making it essential for maintaining operational advantage and security. It emphasizes the need for continuous monitoring and assessment of information dissemination and highlights the importance of training personnel to recognize and mitigate risks related to information exposure.

In contrast, the other options do not encapsulate this specific analytical process aimed at denying adversaries vital information. The analytic process and operational surveillance are more general terms and do not directly address the protective measures for information control. Classified security pertains more to the safeguarding of information through legal and regulatory frameworks rather than an analytical process focused on operational intent and capability denial.