Section: INFORMATION SECURITY GOVERNANCE
Explanation:
The cost of implementing security controls should not exceed the worth of the asset. Annualized loss expectancy represents the losses drat are expected to happen during a single calendar year. A security mechanism may cost more than this amount (or the cost of a single incident) and still be considered cost effective. Opportunity costs relate to revenue lost by forgoing the acquisition of an item or the making of a business decision.

Risks are constantly changing. A previously conducted risk assessment may not include measured risks that have been introduced since the last assessment. Although an assessment can never be perfect and invariably contains some errors, this is not the most important reason for periodic reassessment. The fact that controls can be made more efficient to reduce costs is not sufficient. Finally, risk assessments should not be performed merely to justify the existence of the security function.

Explanation
Decentralization of information security management generally results in better alignment to business unit needs. It is generally more expensive to administer due to the lack of economies of scale. Uniformity in quality of service tends to vary from unit to unit.