This type of IDS is called a network-based IDS because monitors network traffic in real time. Source: KRUTZ, Ronald L. & VINES, Russel D., The CISSP Prep Guide: Mastering the Ten Domains of Computer Security, 2001, John Wiley & Sons, Page 48

"Classical Ciphers:
Substitution
Transposition (Permutation)
Vernam (One-Time Pad)
Book or Running Key
Codes
Steganography"
Pg 189-193 Krutz: CISSP Prep Guide: Gold Edition.

The correct answer is Integrity. The Clark-Wilson model is an integrity model.

Explanation/Reference:
Explanation:
Contact information for all personnel is not required. Contact information is required for specific vendors, emergency agencies, offsite facilities, and any other entity that may need to be contacted in a time of need.
Incorrect Answers:
B: Contact information is required for specific vendors, emergency agencies, offsite facilities, and any other entity that may need to be contacted in a time of need.
C: Documentation of the current system must be incorporated in the contingency plan. This documentation should include equipment and system requirements lists of the hardware, software, firmware and other resources required to support system operations.
D: A vital part of a contingency plan is to conduct the business impact analysis (BIA).
References:
Harris, Shon, All In One CISSP Exam Guide, 6th Edition, McGraw-Hill, 2013, pp. 890, 931

The most likely source of exposure is from the uninformed, accidental or unknowing person, although the greatest impact may be from those with malicious or fraudulent intent.
Source: Information Systems Audit and Control Association, Certified Information Systems Auditor 2002 review manual, Chapter 4: Protection of Information Assets (page 192).