The number of days assigned to a third-party audit is not determined by the auditee's availability, but by the audit program, which considers the audit scope, objectives, criteria, risks, and resources12. The auditee's availability is only one factor that affects the audit planning and scheduling, but not the audit duration3.
Auditors approved for conducting onsite audits do require additional training for virtual audits, as there are significant differences in the skillset required. Virtual audits pose different challenges and opportunities than onsite audits, such as communication, technology, security, and evidence collection4 . Auditors need to be familiar with the tools and techniques for conducting remote audits, as well as the ethical and professional behavior expected in a virtual environment . References:
* PECB Candidate Handbook - ISO 27001 Lead Auditor, page 18
* ISO 19011:2018, Guidelines for auditing management systems, clause 5.3.2
* ISO 19011:2018, Guidelines for auditing management systems, clause 6.3.1
* Deloitte - Conducting a Virtual Internal Audit, page 1
* [A Guide to Conducting Effective and Efficient Remote Audits], page 1
* [ISO 19011:2018, Guidelines for auditing management systems], clause 7.2.3
* [Remote Auditing Best Practices & Checklist for Regulatory Compliance], page 1

Comprehensive and Detailed In-Depth Explanation:
* A. Correct Answer:
* Due professional care refers to auditors carefully considering all relevant factors before initiating an audit.
* In this scenario, the auditors assessed the auditee's context, processes, and expectations, which aligns with ISO 19011:2018 Clause 4 (Principles of Auditing: Due Professional Care).
* B. Incorrect:
* Professional skepticism is about challenging evidence and avoiding assumptions, not about contextual planning.
* C. Incorrect:
* Integrity refers to acting honestly and ethically, which is not the focus here.
Relevant Standard Reference:
* ISO 19011:2018 Clause 4.5 (Due Professional Care)

The following four statements are true according to ISO/IEC 27001's risk management requirements: 12
* The results of risk assessments must be maintained. This is true because clause 8.2.3 of ISO/IEC 27001:
2022 requires the organisation to retain documented information of the information security risk assessment process and the results12
* ISO/IEC 27001 provides an outline approach for the management of risk. This is true because clause
6.1.2 of ISO/IEC 27001:2022 specifies the general steps for the information security risk management process, which include establishing the risk criteria, assessing the risks, treating the risks, and monitoring and reviewing the risks12
* The organisation must produce a risk treatment plan for every business risk identified. This is true because clause 6.1.3 of ISO/IEC 27001:2022 requires the organisation to produce a risk treatment plan that defines the actions to be taken to address the unacceptable risks, the responsibilities, the expected dates, and the resources required12
* Risk assessments should be undertaken following significant changes. This is true because clause 8.2.4 of ISO/IEC 27001:2022 requires the organisation to review and update the risk assessment at planned intervals or when significant changes occur12 The following four statements are false according to ISO/IEC 27001's risk management requirements:
* Risk identification is used to determine the severity of an information security risk. This is false because risk identification is used to identify the assets, threats, vulnerabilities, and existing controls that are relevant to the information security risk management process. The severity of an information security risk is determined by the risk analysis, which evaluates the likelihood and impact of the risk scenarios12
* The organisation must operate a risk treatment process to eliminate its information security risks. This is false because the organisation can choose from four options to treat its information security risks:
avoid, transfer, mitigate, or accept. The organisation does not have to eliminate all its information security risks, but only those that are unacceptable according to its risk criteria12
* The initial phase in an organisation's risk management process should be information security risk assessment. This is false because the initial phase in an organisation's risk management process should be establishing the risk management framework, which includes defining the risk management policy, objectives, scope, roles, responsibilities, and criteria. The information security risk assessment is the second phase in the risk management process12
* Risks assessments should be undertaken at monthly intervals. This is false because there is no fixed frequency for conducting risk assessments in ISO/IEC 27001. The organisation should determine the appropriate intervals for reviewing and updating the risk assessment based on its risk appetite, risk profile, and operational context12 References:
1: ISO/IEC 27001:2022 Lead Auditor (Information Security Management Systems) Course by CQI and IRCA Certified Training 1 2: ISO/IEC 27001 Lead Auditor Training Course by PECB 2

Explanation:

According to ISO 19011:2018, which provides guidelines for auditing management systems, an opening meeting is a formal communication between the audit team and the auditee at the start of an audit1. The purpose of the opening meeting is to confirm the audit objectives, scope and criteria, introduce the audit team and their roles, confirm the audit plan and logistics, explain the audit methods and procedures, and establish the communication channels1. Therefore, if the Managing Director of the client organization invites the audit team to view a new company video lasting 45 minutes during the opening meeting of a Stage 2 audit, the audit team leader should respond in a way that does not compromise the effectiveness and efficiency of the audit or create any misunderstanding or conflict with the auditee. Two possible ways to respond are to advise the Managing Director that the audit team has to keep to the planned schedule, as there may be limited time and resources available for the audit; or to suggest that the video could be viewed during a refreshment break, if it is relevant and useful for the audit and does not interfere with other audit activities1. The other options are not appropriate responses for the audit team leader to make in this situation. For example, stating that the audit team leader will stay behind after the opening meeting to view the video on behalf of the team may imply that the video is not important or relevant for the rest of the audit team; inviting the Managing Director to the auditors' hotel for a viewing that evening may create an impression of bias or favouritism; stating that the audit team will make a decision on the viewing at a later time may be vague or indecisive; and advising the Managing Director that the audit team agrees to his request may result in wasting valuable audit time or losing focus on the audit objectives1. References: ISO 19011:2018 - Guidelines for auditing management systems