Explanation/Reference:
Explanation:
Of the answers given, the iris is the least likely to change over a long period of time which makes the iris pattern better suited for authentication use over a long period of time.
The iris is the colored portion of the eye that surrounds the pupil. The iris has unique patterns, rifts, colors, rings, coronas, and furrows. The uniqueness of each of these characteristics within the iris is captured by a camera and compared with the information gathered during the enrollment phase. Of the biometric systems, iris scans are the most accurate. The iris remains constant through adulthood, which reduces the type of errors that can happen during the authentication process.
Incorrect Answers:
B: A person's voice pattern is less suited for authentication use over a long period of time because the voice pattern can change over time.
C: A person's signature is less suited for authentication use over a long period of time because the signature can change over time.
D: A person's retina pattern is less suited for authentication use over a long period of time because the retina pattern can change over time and can be changed by illnesses such as Diabetes.
References:
Harris, Shon, All In One CISSP Exam Guide, 6th Edition, McGraw-Hill, 2013, p. 191

Configuration management isn't about preventing change but ensuring the integrity of IT resources by preventing unauthorised or improper changes.
According to the Official ISC2 guide to the CISSP exam, a good CM process is one that can:
(1) accommodate change;
(2) accommodate the reuse of proven standards and best practices;
(3) ensure that all requirements remain clear, concise, and valid;
(4) ensure changes, standards, and requirements are communicated promptly and precisely; and
(5) ensure that the results conform to each instance of the product.
Configuration management
Configuration management (CM) is the detailed recording and updating of information that describes an enterprise's computer systems and networks, including all hardware and software components. Such information typically includes the versions and updates that have been applied to installed software packages and the locations and network addresses of hardware devices. Special configuration management software is available. When a system needs a hardware or software upgrade, a computer technician can accesses the configuration management program and database to see what is currently installed. The technician can then make a more informed decision about the upgrade needed.
An advantage of a configuration management application is that the entire collection of systems can be reviewed to make sure any changes made to one system do not adversely affect any of the other systems
Configuration management is also used in software development, where it is called Unified
Configuration Management (UCM). Using UCM, developers can keep track of the source code, documentation, problems, changes requested, and changes made.
Change management
In a computer system environment, change management refers to a systematic approach to keeping track of the details of the system (for example, what operating system release is running on each computer and which fixes have been applied).

The most important reason for identifying threats is to know from what do the assets need protection and what is the likelihood that a threat will occur. Threats cannot be eliminated, but can be anticipated, and safeguards put in place to minimize their impact.
Operations Security provides audit and monitoring for mechanisms, tools and facilities which permit the identification of security events and documentation of subsequent corrective actions.
Source: State of Nebraska - Information Security Systems (ISS) Security Officer Instruction
Guide.

Banners at the log-on time should be used to notify external users of any monitoring that is being conducted. A good banner will give you a better legal stand and also makes it obvious the user was warned about who should access the system and if it is an unauthorized user then he is fully aware of trespassing.
This is a tricky question, the keyword in the question is External user.
There are two possible answers based on how the question is presented, this question could either apply to internal users or ANY anonymous user.
Internal users should always have a written agreement first, then logon banners serve as a constant reminder.
Anonymous users, such as those logging into a web site, ftp server or even a mail server; their only notification system is the use of a logon banner.
References used for this question:
KRUTZ, Ronald L. & VINES, Russel D., The CISSP Prep Guide: Mastering the Ten
Domains of Computer Security, 2001, John Wiley & Sons, Page 50
and
Shon Harris, CISSP All-in-one, 5th edition, pg 873