Human Security means security from threats that challenge survival (such as disease, catastrophes, terrorism, and poverty. As also understood from this definition, the correct answer is B. Environmental Security can be defined as the need to protect humans from natural disasters and extreme weather events (such as tsunamis, earthquakes, tornadoes, and floods) that threaten human life. Protecting technology, data, and information from malicious use or corruption arising from the use of computers and the Internet is termed as cybersecurity. Security means the quality or state of being secure, with freedom from danger, fear or anxiety. International Security means the endeavor of states to ensure security for their citizens.