Which of the following places the Orange Book classifications in order from MOST secure to LEAST secure?

A.
A, B, C, D

B.
D, C, B, A

C.
D, B, A, C

D.
C, D, B, A

Explanation:
The U.S. Department of Defense developed the Trusted Computer System Evaluation Criteria (TCSEC), which
was used to evaluate operating systems, applications, and different products. These evaluation criteria are
published in a book known as the Orange Book.
TCSEC provides a classification system that is divided into hierarchical divisions of assurance levels:
A:
Verified protection
B:
Mandatory protection
C:
Discretionary protection
D:
Minimal security
Classification A represents the highest level of assurance, and D represents the lowest level of assurance.
Incorrect Answers:
B: Classification A represents the highest level of assurance, and D represents the lowest level of assurance.
C: Classification A represents the highest level of assurance, and D represents the lowest level of assurance.
D: Classification A represents the highest level of assurance, and D represents the lowest level of assurance.

Harris, Shon, All In One CISSP Exam Guide, 6th Edition, McGraw-Hill, New York, 2013, pp. 392-393