Section: Security Operation Adimnistration
Explanation/Reference:
Running the source comparison program between control and current source periodically allows detection, not prevention, of unauthorized changes in the production environment. Other options are preventive controls.
Source: Information Systems Audit and Control Association, Certified Information Systems Auditor 2002 review manual, chapter 6: Business Application System Development, Acquisition, Implementation and Maintenance (page 309).

The cost of a countermeasure should not be greater in cost than the risk it mitigates (ALE). For a quantitative risk assessment, the equation is ALE = ARO x SLE where the SLE is calculated as the product of asset value x exposure factor. An event that happen once every five years would have an ARO of .2 (1 divided by 5).
SLE = Asset Value (AV) x Exposure Fact (EF) SLE = 1,000,000 x .30 = 300,000
ALE = SLE x Annualized Rate of Occurance (ARO) ALE = 300,000 x .2 = 60,000
Know your acronyms: ALE -- Annual loss expectancy ARO -- Annual rate of occurrence SLE -- Single loss expectancy
The following are incorrect answers:
$300,000 is incorrect. See the explanation of the correct answer for the correct calculation. $150,000 is incorrect. See the explanation of the correct answer for the correct calculation. $1,500 is incorrect. See the explanation of the correct answer for the correct calculation.
Reference(s) used for this question:
Mc Graw Hill, Shon Harris, CISSP All In One (AIO) book, Sixth Edition , Pages 87-88 and Official ISC2 Guide to the CISSP Exam, (OIG), Pages 60-61

IT auditors determine whether systems are in compliance with the security policies, procedures, standards, baselines, designs, architectures, management direction and other requirements" and "provide top company management with an independent view of the controls that have been designed and their effectiveness."
"Information systems security professionals" is incorrect. Security professionals develop the security policies and supporting baselines, etc.
"Data owners" is incorrect. Data owners have overall responsibility for information assets and assign the appropriate classification for the asset as well as ensure that the asset is protected with the proper controls.
"Data custodians" is incorrect. Data custodians care for an information asset on behalf of the data owner.
References:
CBK, pp. 38 - 42. AIO3. pp. 99 - 104

The keyword is ' MOST CRITICAL ' and the correct answer is ' Management Support ' as the management must be convinced of its necessity and that's why a business case must be made. The decision of how a company should recover from any disaster is purely a business decision and should be treated as so.
The other answers are incorrect because :
Security policy is incorrect as it is not the MOST CRITICAL piece.
Availability of backup information processing facilities is incorrect as this comes once the organization has BCP Plans in place and for a BCP Plan , management support must be there.
Staff training comes after the plans are in place with the support from management. Reference : Shon Harris , AIO v3 , Chapter-9: Business Continuity Planning , Page : 697.

Explanation/Reference:
security awareness training is to modify employees behaviour and attitude towards towards enterprise's security posture.
Security-awareness training is performed to modify employees' behavior and attitude toward security. This can best be achieved through a formalized process of security-awareness training.
It is used to increase the overall awareness of security throughout the company. It is targeted to every single employee and not only to one group of users.
Unfortunately you cannot apply a patch to a human being, the only thing you can do is to educate employees and make them more aware of security issues and threats. Never underestimate human stupidity.
Reference(s) used for this question:
TIPTON, Hal, (ISC)2, Introduction to the CISSP Exam presentation.
also see:
Harris, Shon (2012-10-18). CISSP All-in-One Exam Guide, 6th Edition (p. 130). McGraw-Hill. Kindle Edition.