Type C fire extinguishers deal with electrical fires. They are most likely to be found
around a digital information processing facility or data center.
Type A is for common combustibles
Type B is for liquids (petroleum products and coolants)
Type D is used specifically for fighting flammable metal fires (eg: magnesium). Additionally
Class K fires are caused by cooking oils and fats. They typically burn much hotter than Class B
fires and are extinguished using wet chemical (alkali) fire extinguishers.
To remember the 4 classes of fire and what they are you can think about my first name which is
CLEMENT. See an example of this below:
Class Type
A Common combustible
B Liquid
C Electrical Fire
D Metal Burning
References:
Source: HARRIS, Shon, All-In-One CISSP Certification Exam Guide, McGraw-Hill/Osborne, 2002,
chapter 6: Physical security (page 312).
Underwriters Laboratory's Rating and Testing of Fire Extinguishers (UL 711).
National Fire Protection Association's glossary. http://en.wikipedia.org/wiki/Fire_classes http://en.wikipedia.org/wiki/Fire_extinguisher http://en.wikipedia.org/wiki/Fire_retardant_foam

Under the principle of separation of duties, an operator should not be performing data entry. This should be left to data entry personnel.
System operators represent a class of users typically found in data center environments where mainframe systems are used. They provide day-to-day operations of the mainframe environment, ensuring that scheduled jobs are running effectively and troubleshooting problems that may arise. They also act as the arms and legs of the mainframe environment, load and unloading tape and results of job print runs. Operators have elevated privileges, but less than those of system administrators. If misused, these privileges may be used to circumvent the system's security policy. As such, use of these privileges should be monitored through audit logs.
Some of the privileges and responsibilities assigned to operators include:
Implementing the initial program load: This is used to start the operating system. The boot process or initial program load of a system is a critical time for ensuring system security. Interruptions to this process may reduce the integrity of the system or cause the system to crash, precluding its availability.
Monitoring execution of the system: Operators respond to various events, to include errors, interruptions, and job completion messages.
Volume mounting: This allows the desired application access to the system and its data.
Controlling job flow: Operators can initiate, pause, or terminate programs. This may allow an operator to affect the scheduling of jobs. Controlling job flow involves the manipulation of configuration information needed by the system. Operators with the ability to control a job or application can cause output to be altered or diverted, which can threaten the confidentiality.
Bypass label processing: This allows the operator to bypass security label information to run foreign tapes (foreign tapes are those from a different data center that would not be using the same label format that the system could run). This privilege should be strictly controlled to prevent unauthorized access.
Renaming and relabeling resources: This is sometimes necessary in the mainframe environment to allow programs to properly execute. Use of this privilege should be monitored, as it can allow the unauthorized viewing of sensitive information.
Reassignment of ports and lines: Operators are allowed to reassign ports or lines. If misused, reassignment can cause program errors, such as sending sensitive output to an unsecured location. Furthermore, an incidental port may be opened, subjecting the system to an attack
through the creation of a new entry point into the system.
Reference(s) used for this question:
Hernandez CISSP, Steven (2012-12-21). Official (ISC)2 Guide to the CISSP CBK, Third Edition
((ISC)2 Press) (Kindle Locations 19367-19395). Auerbach Publications. Kindle Edition.

The Urgent Pointer is used when some information has to reach the server ASAP. When the TCP/IP stack at the other end sees a packet using the Urgent Pointer set, it is duty bound to stop all ongoing activities and immediately send this packet up the stack for immediate processing. Since the packet is plucked out of the processing queue and acted upon immediately, it is known as an Out Of Band (OOB) packet and the data is called Out Of Band (OOB) data.
The Urgent Pointer is usually used in Telnet, where an immediate response (e.g. the echoing of characters) is desirable. Covert Channels are not directly synonymous with backdoors. A covert channel is simply using a communication protocol in a way it was not intended to be used or sending data without going through the proper access control mechanisms or channels. For example, in a Mandatory Access Control systems a user at secret has found a way to communicate information to a user at Confidential without going through the normal channels.
In this case the Urgent bit could be use for a few reasons:
1.It could be to attempt a Denial of service where the host receiving a packet with the Urgent bit set will give immediate attention to the request and will be in wait state until the urgent message is receive, if the sender does not send the urgent message then it will simply sit there doing nothing until it times out. Some of the TCP/IP stacks used to have a 600 seconds time out, which means that for 10 minutes nobody could use the port. By sending thousands of packet with the URGENT flag set, it would create a very effective denial of service attack.
2.It could be used as a client server application to transmit data back and forward without going through the proper channels. It would be slow but it is possible to use reserved fields and bits to transmit data outside the normal communication channels.
The other answers are incorrect The following reference(s) were/was used to create this question: http://www.vijaymukhi.com/vmis/tcp.htm and http://www.fas.org/irp/nsa/rainbow/tg030.htm document covering the subject of covert channels and also see: http://gray-world.net/papers.shtml which is a large collection of documents on Covert Channels

Communications devices must operate at the same speed to communicate.
Source: KRUTZ, Ronald L. & VINES, Russel D., The CISSP Prep Guide: Mastering the Ten
Domains of Computer Security, 2001, John Wiley & Sons, Page 100.

A query plan is comprised of implementation procedures that correspond to each of the low-level operations in that query.
Source: KRUTZ, Ronald L. & VINES, Russel D., The CISSP Prep Guide: Mastering the
Ten Domains of Computer Security, 2001, John Wiley & Sons, Page 47.