Which of the following is NOT a function of Homeland Security?

The correct answer is C, maintaining public education standards. This option does not relate to the core missions and functions of Homeland Security, which focuses on protecting the nation from threats, managing borders and immigration laws, and securing various aspects of society, including cyberspace.

Homeland Security is primarily concerned with ensuring the safety and security of the country in response to domestic and international threats. Securing and managing borders involves monitoring and controlling who enters and exits the country. Enforcing and administering immigration laws is a critical role to ensure that the immigration system is functioning in a lawful and orderly manner. Safeguarding and securing cyberspace is increasingly relevant in today's world, as emerging threats in technology require attention to protect national infrastructures and personal data.

In contrast, maintaining public education standards falls under the responsibility of educational institutions and local, state, or federal educational departments, not Homeland Security. This distinction illustrates that while Homeland Security aims to protect citizens and national interests, educational standards are a separate domain focused on academic quality and outcomes.