Please answer the following questions separately and in regards to computer security and cite all scholarly references used:

1.    List factors that would cause you to be more or less convinced that a particular email is or is not authentic.
2.    In your opinion, what are two disadvantages of using physical separation in a computing system. List two disadvantages of using temporal separation in a computing system.

Textbook:
Pfleeger, Charles P. / Pfleeger, Shari Lawrence, and Marguiles, Jonathan, (2015).  Security in Computing, Fifth, Prentice Hall.