Discussion - 400-600 words with atleast 2 references

Research the different types of physical barriers that are defined and described in the chapter. Answer the following questions. 

1. Describe the characteristics of a high-security door, to include the type. 
2. Describe the characteristics of a high-security roof, including the type.
3. Describe a maximum security fence, why are fences not the best barriers?

• In proper APA format, write a minimum of 3 paragraphs, one or more for each question.