A service provider is a third-party supplier that provides IT services or products to an organization. A service provider should comply with the organization’s information security requirements, such as policies, standards, procedures, and controls, to ensure the confidentiality, integrity, and availability of the organization’s data and systems. The best way to provide an information security manager with sufficient assurance that a service provider complies with the organization’s information security requirements is to have the ability to audit the third-party supplier’s IT systems and processes. An audit is a systematic and independent examination of evidence to determine the degree of conformity to predetermined criteria. An audit can verify the effectiveness and efficiency of the service provider’s security controls, identify any gaps or weaknesses, and provide recommendations for improvement. An audit can also ensure that the service provider adheres to the contractual obligations and service level agreements (SLAs) with the organization. Therefore, option B is the most appropriate answer.

Option A is not the best answer because a live demonstration of the third-party supplier’s security capabilities may not be comprehensive, objective, or reliable. A live demonstration may only show the positive aspects of the service provider’s security, but not reveal any hidden or potential issues. A live demonstration may also be subject to manipulation or deception by the service provider.

Option C is not the best answer because third-party security control self-assessment (CSA) results may not be accurate, complete, or consistent. A self-assessment is a process where the service provider evaluates its own security controls against a set of criteria or standards. A self-assessment may be biased, subjective, or incomplete, as the service provider may not disclose or report all the relevant information or issues. A self-assessment may also vary in quality and scope depending on the service provider’s expertise, resources, and methodology.

Option D is not the best answer because an independent review report indicating compliance with industry standards may not be sufficient or specific for the organization’s information security requirements. An independent review is a process where an external party evaluates the service provider’s security controls against a set of industry standards or best practices, such as ISO/IEC 27001, NIST CSF, PCI DSS, etc. An independent review report may provide a general overview of the service provider’s security posture, but not address the organization’s unique or specific security needs, risks, or expectations. An independent review report may also be outdated, limited, or generic, as the industry standards or best practices may not reflect the current or emerging security threats or trends. References = CISM Review Manual 15th Edition1, pages 257-258; CISM Review Questions, Answers & Explanations Database - 12 Month Subscription, QID 301.

An independent review report indicating compliance with industry standards BEST provides an information security manager with sufficient assurance that a service provider complies with the organization’s information security requirements. This is because an independent review report is an objective and reliable source of evidence that the service provider has implemented and maintained effective security controls that meet the industry standards and best practices. An independent review report can also provide assurance that the service provider has addressed any gaps or weaknesses identified in previous audits or assessments.