A partitioned security mode is a mode of operation wherein all personnel have the clearance but not necessarily formal access approval and need-to-know for all information contained in the system. *Answer "All personnel have the clearance and formal access approval" is a compartmented security modE. A compartmented security mode is a mode of operation wherein all personnel have a valid personnel clearance, formal access approval and signed nondisclosure agreements, and valid need-to-know for that information to which he/she is to have access. *Answer "The only state in which certain privileged instructions may beexecuted" is executive statE. Executive state is one of several states in which a system may operate and the only one in which certain privileged instructions may be executeD. Such instructions cannot be executed when the system is operating in other (e.g., user) states.
Synonymous with supervisor state. *Answer "A system containing information accessed by personnel with different security clearances" is multilevel securE. Multilevel secure is a class of system containing information with different sensitivities that simultaneously permits access by users with different security clearances and needs-to-know, but prevents users from obtaining access to information for which they lack authorization. Source: DoD 5200.28-STD Department of Defense Trusted Computer System Evaluation Criteria.

Explanation: RAID 1 or Mirroring is a technique in which data is written to two duplicate disks simultaneously through a copy process. This way if one of the disk drives fails, the system can instantly switch to the other disk without any loss of data or service. Disk mirroring is used commonly in on-line database systems where it's critical that the data be accessible at all times. RAID means "Redundant Array of Inexpensive Disks".

Explanation/Reference:
Explanation:
Data diddling refers to the alteration of existing data. Many times, this modification happens before the data is entered into an application or as soon as it completes processing and is outputted from an application. For instance, if a loan processor is entering information for a customer's loan of $100,000, but instead enters $150,000 and then moves the extra approved money somewhere else, this would be a case of data diddling. Another example is if a cashier enters an amount of $40 into the cash register, but really charges the customer $60 and keeps the extra $20.
This type of crime is extremely common and can be prevented by using appropriate access controls and proper segregation of duties. It will more likely be perpetrated by insiders, who have access to data before it is processed.
Incorrect Answers:
B: Salami techniques: A salami attack is the one in which an attacker commits several small crimes with the hope that the overall larger crime will go unnoticed. This is not what is described in the question.
C: A Trojan Horse is a program that is disguised as another program. This is not what is described in the question.
D: A Virus is a small application or a string of code that infects applications. This is not what is described in the question.
References:
Harris, Shon, All In One CISSP Exam Guide, 6th Edition, McGraw-Hill, 2013, p. 1059

Reference:
https://resources.infosecinstitute.com/category/certifications-training/cissp/domains/security-operations/vulnerab

The answer is a personnel control. Most support and operations
staff have special access to the system. Some organizations conduct
background checks on individuals filling these positions to screen
out possibly untrustworthy individuals.
*Answer "Sanitizing the media before disposition": The process of removing information from media before disposition is called sanitization. Three techniques are commonly used
for media sanitization: overwriting, degaussing, and destruction.
*Answer "Printing to a printer in a secured room": It may be necessary to actually output data to the media in a secure location, such as printing to a printer in a locked room
instead of to a general-purpose printer in a common area.
*Answer "Physically protecting copies of backup media": Physical protection of copies of backup media stored offsite should be accorded a level of protection equivalent to media
containing the same information stored onsite.
Source: National Institute of Standards and Technology, An Introduction to Computer Security: The NIST Handbook Special Publication 800-12.