What constitutes a compromise of classified information?

The correct answer identifies a compromise of classified information as situations where that information is accessed by unauthorized individuals or disclosed. This aligns with the primary concern surrounding classified information, which is to ensure it remains protected and accessible only to those with the appropriate security clearance or need-to-know basis.

A compromise occurs when security measures are breached, allowing individuals who do not have the proper authorization to gain access or when sensitive information is made available to the public without proper clearance. Such breaches can lead to significant risks to national security or the safety of individuals.

In contrast, the other choices do not accurately represent a compromise of classified information. Allowing access by authorized personnel does not constitute a compromise; rather, it is how security is intended to function. Public disclosure for transparency typically involves making information available legally and responsibly, rather than revealing classified materials. Finally, storing classified information in secure facilities is a practice designed to prevent compromise, not a scenario that represents a compromise itself.