Which of the following is a basic security tenet for classified information?

The correct answer emphasizes that schemes for handling classified information prioritize controlled access. The concept of delayed entry refers to limiting who can access classified information and when they can do so, ensuring that sensitive data is viewed or utilized only by authorized personnel at appropriate times. This measure helps to protect against unauthorized disclosures and maintains the integrity of the information.

In a secure environment, individuals are often required to go through a vetting process before being granted access, and their ability to engage with the information is monitored and restricted according to specific protocols. This is foundational for maintaining national security and protecting classified materials from potential risks.