It is possible to explain, analyze and understand the international security in six levels:

• Individual level: Security for the individual.

• Societal level: Security for the social group, i.e. ethnic, national, religious, linguistic, or community groups.

• National level: Security for the state or nation.

• Regional level: Security for the region, that is, a coherent security region.

• International level: Security for the international society, the society of nations, and most states in the world.

• Global level: Security for the planet Earth and space. 

Therefore, the correct option is C.