A security administrator must implement a system that will support and enforce the following file
system access control model:
FILE NAMESECURITY LABEL
Employees.docConfidential
Salary.xlsConfidential
OfficePhones.xlsUnclassified
PersonalPhones.xlsRestricted
Which of the following should the security administrator implement?

A.
White and black listing

B.
SCADA system

C.
Trusted OS

D.
Version control

Explanation:
A trusted operating system (TOS) is any operating system that meets the government’s
requirements for security. Trusted OS uses a form of Mandatory access control called Multi-Level
Security.
The Mandatory access control (MAC) is a form of access control commonly employed by
government and military environments. MAC specifies that access is granted based on a set of
rules rather than at the discretion of a user. The rules that govern MAC are hierarchical in nature
and are often called sensitivity labels, security domains, or classifications.
MLS is an implementation of MAC that focuses on confidentiality. A Multi-Level Security operating
system is able to enforce the separation of multiple classifications of information as well as
manage multiple users with varying levels of information clearance. The military and intelligence
community must handle and process various hierarchical levels of classified information. At the
high-end there is Top Secret, followed in turn by Secret, Confidential, and Unclassified: