The IS auditor's best course of action if they suspect an organization's computer may have been used to commit a crime is to contact the incident response team to conduct an investigation. The incident response team is a group of experts who are responsible for responding to security incidents, such as data breaches, ransomware attacks, or cybercrimes. The incident response team can help to preserve and collect digital evidence, determine the scope and impact of the incident, contain and eradicate the threat, and restore normal operations. The IS auditor should not examine the computer themselves, as they may inadvertently alter or destroy potential evidence, or compromise the chain of custody. The IS auditor should also not notify local law enforcement before further investigation, as this may escalate the situation unnecessarily or interfere with the internal investigation process. The IS auditor should advise management of the crime after the investigation, or as soon as possible if there is an imminent risk or legal obligation to do so.

Enterprise architecture (EA) governance ensures that IT and business alignment is maintained and that new processes and technologies integrate well with existing structures.
Option A (Correct):The primary purpose of EA governance is to ensure that new technologies, processes, and systems align and harmonize with existing architecture to maintain operational efficiency and consistency.
Option B (Incorrect):While adaptability to emerging technology trends is important, EA governance focuses more on structure, consistency, and compliance rather than just adaptability.
Option C (Incorrect):Compliance with regulations is crucial, but it is just one component of governance. EA governance has a broader scope, including strategic alignment and process integration.
Option D (Incorrect):Ensuring ROI is an important financial consideration, but it is not themainobjective of EA governance.
Reference:ISACA CISA Review Manual -Domain 1: Information Systems Auditing Process- Covers governance, risk management, and ensuring alignment of EA with business objectives.

The correct answer is B. Vulnerability scanning.
For a very large e-commerce platform, vulnerability scanning is the best technique among the options because it provides automated, broad coverage for identifying security weaknesses across web applications, servers, interfaces, and related components. ISACA defines vulnerability scanning as an automated process used to proactively identify security weaknesses in a network or individual system. ISACA's CISA Exam Content Outline also includes threat and vulnerability management and the use of technical security testing to identify potential vulnerabilities.
Option A, code review, can be very useful for identifying insecure coding practices and logic flaws, but it is usually more time-consuming and less practical as the primary technique for a very large e-commerce environment. It may also require access to source code and specialized development expertise.
Option C, logical security testing, focuses mainly on access rights, authentication, authorization, and logical access controls. It is important, but it is narrower than vulnerability scanning for identifying web application security flaws.
Option D, penetration testing, is valuable because it attempts to exploit vulnerabilities in a controlled manner.
ISACA defines penetration testing as a live test of security defenses by mimicking real-life attackers.
However, penetration testing is usually more targeted and is often used to validate exploitability of vulnerabilities. For broad identification of web application flaws in a very large platform, vulnerability scanning is the stronger answer.
This question maps mainly to Protection of Information Assets because the CISA Exam Content Outline includes security testing tools and techniques, security monitoring, threat and vulnerability management, and protection of information assets under Domain 5.
References: ISACA CISA Exam Content Outline, Domain 5; ISACA Interactive Glossary, "Vulnerability scanning," "Vulnerability management," and "Penetration testing."