Explanation: Changes to a Trusted Computing Base (TCB) system that could impact the security posture of that system and trigger a recertification activity are documented in the security impact analysis. A TCB system is a system that consists of the hardware, software, and firmware components that enforce the security policy and protect the security-relevant information of the system. A TCB system is usually certified or accredited to meet certain security standards or criteria, such as the Common Criteria or the Trusted Computer System Evaluation Criteria (TCSEC). A security impact analysis is a document that describes the changes made to a TCB system, such as adding, modifying, or removing components or functions, and analyzes the potential effects of the changes on the security of the system, such as introducing new vulnerabilities, risks, or threats. A security impact analysis can help to determine whether the changes require a recertification or reaccreditation of the TCB system, or whether the changes can be accepted without affecting the security level or assurance of the system. The other options are not the documents that document the changes to a TCB system, but rather different types of documents. A structured code review is a document that records the results of a systematic and rigorous examination of the source code of a software component or system, such as a TCB system, to detect errors, bugs, or vulnerabilities. A structured code review can help to improve the quality, reliability, and security of the software, but it does not document the changes made to the software. A routine self assessment is a document that reports the findings and recommendations of a periodic and voluntary evaluation of the security controls and measures of a system or organization, such as a TCB system, to measure the effectiveness, efficiency, and compliance of the security. A routine self assessment can help to identify and address the security gaps, weaknesses, or issues, but it does not document the changes made to the system. A cost benefit analysis is a document that compares the costs and benefits of different security solutions or alternatives for a system or organization, such as a TCB system, to justify the investment in security. A cost benefit analysis can help to evaluate the trade-offs between the security costs and the security benefits, but it does not document the changes made to the system. References: CISSP All-in-One Exam Guide, Eighth Edition, Chapter 8, p. 416; Official (ISC)2 CISSP CBK Reference, Fifth Edition, Chapter 3, p. 149.