The most effective method for detecting the presence of an unauthorized wireless access point on an internal network is A. Continuous network monitoring. This is because continuous network monitoring can capture and analyze all the wireless traffic in the network and identify any rogue or spoofed devices that may be connected to the network without authorization. Continuous network monitoring can also alert the system administrator of any suspicious or anomalous activities on the network and help to locate and remove the unauthorized wireless access point quickly.
Periodic network vulnerability assessments (B) can also help to detect unauthorized wireless access points, but they are not as effective as continuous network monitoring, because they are performed at fixed intervals and may miss some devices that are added or removed between the assessments. Review of electronic access logs can provide some information about the devices that access the network, but they may not be able to detect devices that use fake or stolen credentials or devices that do not generate any logs. Physical security reviews (D) can help to prevent unauthorized physical access to the network ports or devices, but they may not be able to detect wireless access points that are hidden or disguised as legitimate devices.

Requiring documentation that the finding will be addressed within the new system is the best course of action for a follow-up audit. An IS auditor should obtain evidence that the complex security vulnerability of low risk will be resolved in the new system and that there is a reasonable timeline for its implementation. The other options are not appropriate courses of action, as they may be too costly, time-consuming, or impractical for a low-risk finding. References:
* CISA Review Manual (Digital Version), Chapter 2, Section 2.5.31
* CISA Review Questions, Answers & Explanations Database, Question ID 209

The most important responsibility of data owners when implementing a data classification process is determining appropriate user access levels (option C). This is because:
Data owners are the persons or entities that have the authority and responsibility for the business processes and functions that collect, use, store, and dispose of data1.
Data owners are accountable for ensuring that the data is handled in compliance with the applicable laws, regulations, policies, and standards, such as the GDPR and the PIPEDA1234.
Data owners are in the best position to determine the purpose and necessity of collecting and retaining data, as well as the risks and benefits associated with it1.
Data owners should consult with other stakeholders, such as the risk manager, the database administrator (DBA), and the privacy manager, to establish and implement appropriate data classification policies and procedures2.
Data classification is the process of organizing data in groups based on their attributes and characteristics, and then assigning class labels that describe a set of attributes that hold true for the corresponding data sets345.
Data classification helps organizations to identify, manage, protect, and understand their data, as well as to comply with modern data privacy regulations345.
Data classification also helps to determine appropriate user access levels, which means defining who can access, modify, share, or delete data based on their roles, responsibilities, and needs345.
Determining appropriate user access levels is the most important responsibility of data owners when implementing a data classification process, as it ensures that only authorized and legitimate users can access sensitive or important data. This provides confidentiality, integrity, availability, and accountability of data345.
Reviewing emergency changes to data (option A), authorizing application code changes (option B), and implementing access rules over database tables (option D) are not the most important responsibilities of data owners when implementing a data classification process. These are more related to the operational aspects of data management, which are usually delegated to other roles, such as the DBA or the IT staff. The data owner should oversee and approve these activities, but not perform them directly1.