A security audit involves a structured, comprehensive review of an organization's security policies, procedures, controls, and compliance posture, making it the most suitable method for gaining a full picture of a target company's security posture during due diligence for an acquisition. In contrast, a tabletop exercise only evaluates incident response readiness through a discussion-based scenario, a penetration test only identifies exploitable technical vulnerabilities in specific systems, and a threat model focuses narrowly on identifying and prioritizing threats to particular systems or applications — none of which provide the broad, holistic view an audit offers.
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