security systems

1.Research the differences of minimum, low, medium, and maximum security prisons, using the website: http://www.bop.gov/ 

2.Use the information found at: http://nces.ed.gov/pubs98/safetech/chapter5.asp

to research how determining possible physical threats may affect the choice of physical security countermeasures while planning new or updated security systems.

3.Research the different types of physical barriers and how they fit the needs of different types of facilities. Use the information found at: http://www.fs.fed.us/t-d/phys_sec/deter/index.htm]

4.Research the importance of a security plan in justifying funding for facility security measures, using the information at the website: http://www.facilitiesnet.com/security/article/Does-Your-Facility-Have-a-Security-Plan--12589

please give me all answer in brief.