Which of the following is MOST effective in detecting information hiding in Transmission Control Protocol/internet Protocol (TCP/IP) traffic?

Refer to the information below to answer the question.
In a Multilevel Security (MLS) system, the following sensitivity labels are used in increasing levels of sensitivity: restricted, confidential, secret, top secret. Table A lists the clearance levels for four users, while Table B lists the security classes of four different files.

Which of the following is true according to the star property (*property)?

A user sends an e-mail request asking for read-only access to files that are not considered sensitive. A Discretionary Access Control (DAC) methodology is in place. Which is the MOST suitable approach that the administrator should take?

Which type of security testing is being performed when an ethical hacker has no knowledge about the target system but the testing target is notified before the test?

What is the PRIMARY goal for using Domain Name System Security Extensions (DNSSEC) to sign records?