The simple integrity axiom of the Biba access control model states that a subject at one level of integrity is not permitted to observe an object of a lower integrity (no read down). Source: KRUTZ, Ronald L. & VINES, Russel D., The CISSP Prep Guide: Mastering the Ten Domains of Computer Security, John Wiley & Sons, 2001, Chapter 5: Security Architectures and Models (page 205).

Single Loss Expectancy (SLE) is the dollar amount that would be lost if there was a loss of an asset. Annualized Rate of Occurrence (ARO) is an estimated possibility of a threat to an asset taking place in one year (for example if there is a change of a flood occuring once in 10 years the ARO would be .1, and if there was a chance of a flood occuring once in 100 years then the ARO would be .01).
The following answers are incorrect:
gross loss expectancy x loss frequency. Is incorrect because this is a distractor.
actual replacement cost - proceeds of salvage. Is incorrect because this is a distractor.
asset value x loss expectancy. Is incorrect because this is a distractor.

Signature identification systems analyze two different areas of an individual's signature: the specific features of the signature and specific features of the process of signing one's signature. Features that are taken into account and measured include speed, pen pressure, directions, stroke length, and the points in time when the pen is lifted from the paper.

This is one of the best practices because its not good to be lead and report to the same person, in that case, that person could take possession of everything that is happening and hurt the enterprise, we can't let that to happen with security concerns. The best practice is to always be lead by a different person that the one you report to, this can be checked in real life. An advice, always try to report to the highest person you can inside the company.

Discussion: Implicit Deny is a method of controlling access to data by denying access to ALL data then granting only to what the user needs to do their jobs.
The converse being Explicit Deny where you only deny access for users for a smaller set of data and permit access to all other data. (Worst practice)
Similar to the term of least privilege where users are only given access to data the must have in order to carry out their job duties, Implicit Deny principle denies by default access to information.
More simply put, access to ALL data is denied by default and only necessary access is given to data so they employee can carry out their job duties.
This term is common to firewalls or other filtering devices where, unless traffic is specifically permitted it is denied by default to enhance security.
The following answers are incorrect:
- Explicit Deny: Sorry, this is incorrect. Explicit Deny means users are given access to ALL data and only denied to a smaller subset of data. This a dangerous practice for information security.
- Implied Permissions: Sorry, incorrect answer. This isn't a commonly used term in risk reduction methodology.
- Explicit Permit: Sorry, also incorrect. Explicit means users are specifically given access but isn't used normally with the permit rule.
The following reference(s) was used to create this question:
2013. Official Security+ Curriculum.