Which of the following best describes nuclear storage security?

Nuclear storage security is fundamentally centered around safeguarding nuclear materials from unauthorized access, which is why implementing measures against such access is the most critical and defining aspect. This involves utilizing sophisticated systems like surveillance, access control, and physical barriers to prevent theft, sabotage, or any misuse of nuclear materials.

While ensuring a proper storage location helps in the overall safety and efficiency of nuclear material management, it does not directly address the security aspect as robustly as measures against unauthorized access do. Enhancing communication between facilities can facilitate improved safety and operational coordination but is not directly related to securing the material itself. Strictly regulating the transport of nuclear materials is essential for preventing incidents during transit but does not encompass the security of materials that are already stored. Thus, the focus on unauthorized access measures encapsulates a core principle of nuclear storage security, making it the best answer among the provided choices.