What type of security ensures protection of classified information in the private sector?

Industrial security is the correct choice for ensuring the protection of classified information in the private sector. Industrial security involves safeguarding sensitive and classified information that may be held by private sector organizations, particularly those that engage in government contracting or possess sensitive data related to national security. This branch of security encompasses a range of practices designed to prevent unauthorized access, theft, or sabotage of classified information.

Industrial security measures typically include the implementation of security clearances for personnel, securing physical locations where sensitive information is stored, and establishing strict protocols for handling and disseminating classified materials. These practices are crucial for maintaining compliance with government regulations and ensuring that sensitive data, which could affect national security, is adequately protected.

While personnel security focuses on screening and monitoring individuals to ensure they do not pose a threat, and information security deals primarily with the protection of data in various forms, industrial security is uniquely tasked with the overall coordination of security measures related specifically to classified information within private sector environments. Communications security pertains to protecting communications themselves but does not encompass the broader aspects of safeguarding classified information within an organization's infrastructure.