According to the ISO/IEC 27001 Lead Auditor exam preparation guide1, audit evidence can be in various formats, such as records, statements of fact, or other information that is relevant and verifiable. Audit evidence can be collected by means of interviews, observation, sampling, testing, or other techniques. However, not all formats of audit evidence are acceptable or reliable. For example, unsigned hand written changes to test results (A) are not verifiable and may indicate tampering or falsification. Statements by a system engineer that cannot be verified (D) are also not reliable and may be biased or inaccurate. An audio recording of a dialog between the IT manager and a system engineer (F) may not be relevant to the audit criteria or may violate the confidentiality or consent of the parties involved. A statement of facts by the IT manager (B) may be relevant and verifiable, but it is not sufficient as audit evidence unless it is supported by other sources of information. Therefore, the two acceptable formats of audit evidence are documented information on results of IT audits © and observation of a previously recorded video demonstrating the performance of a hazardous activity (E), as they are relevant to the audit criteria and can be verified by other means. References: 1: https://pecb.com/pdf/exam-preparation-guides/pecb-iso-iec-27001-lead-auditor-exam-preparation-guide.pdf (page 9)