Conduct a study using your textbook and outside sources on the challenges of security and protection. Write a five-page essay in APA format addressing the following concepts: Explain the differences between the following elements: international security and national security, national security and homeland security, and preparedness and mitigation. Explain the individual challenges of national security, homeland security, international security, and human security. In two of these domains, identify security examples of avoidance and transference. Analyze obstacles and vulnerabilities of the critical infrastructure key resources (CIKRs) of each domain. All sources used, including the textbook, must be referenced; paraphrased and quoted material must have accompanying citations.