Explanation
The first consideration for ensuring that endpoints are protected in line with the privacy policy is hardening the operating systems of endpoint devices. Hardening is a process of applying security configurations and controls to reduce the attack surface and vulnerabilities of an operating system. Hardening can include disabling unnecessary services and features, applying security patches and updates, enforcing strong passwords and encryption, configuring firewall and antivirus settings, and implementing least privilege principles. Hardening the operating systems of endpoint devices can help prevent unauthorized access, data leakage, malware infection, or other threats that may compromise the privacy of personal data stored or processed on those devices.
Detecting malicious access through endpoints, implementing network traffic filtering on endpoint devices, and managing remote access and control are also important aspects of endpoint security, but they are not the first consideration. Rather, they are dependent on or complementary to hardening the operating systems of endpoint devices. For example, detecting malicious access requires having a baseline of normal activity and behavior on the endpoint device, which can be established by hardening. Implementing network traffic filtering requires having a firewall or other network security tool installed and configured on the endpoint device, which is part of hardening. Managing remote access and control requires having authentication and authorization mechanisms in place on the endpoint device, which is also part of hardening.
References: Manage endpoint security policies in Microsoft Intune, ENDPOINT SECURITY POLICY, How To Build An Effective Endpoint Security Policy And Prevent Cyberattacks

Explanation
The best testing method to identify and review the application's runtime modules is dynamic application security testing (DAST). DAST is a testing technique that analyzes the application's behavior and functionality during its execution. DAST can detect security and privacy vulnerabilities that are not visible in the source code, such as injection attacks, cross-site scripting, broken authentication, sensitive data exposure, or improper error handling. DAST can also simulate real-world attacks and test the application's response and resilience. DAST can provide a comprehensive and realistic assessment of the application's security and privacy posture in the pre-production environment. References:
* [ISACA Glossary of Terms]
* [OWASP Top 10 Web Application Security Risks]
* [ISACA CDPSE Review Manual, Chapter 2, Section 2.4.2]
* [ISACA Journal, Volume 6, 2018, "Dynamic Application Security Testing"]

Explanation
Conducting a risk assessment of all candidate vendors is the best way to provide assurance that a potential vendor is able to comply with privacy regulations and the organization's data privacy policy, because it allows the organization to evaluate the vendor's privacy practices, controls, and performance against a set of criteria and standards. A risk assessment can also help to identify any gaps, weaknesses, or threats that may pose a risk to the organization's data privacy objectives and obligations. A risk assessment can be based on various sources of information, such as self-attestations, documentation, audits, or independent verification. A risk assessment can also help to prioritize the vendors based on their level of risk and impact, and to determine the appropriate mitigation or monitoring actions.
References:
* 8 Steps to Manage Vendor Data Privacy Compliance, DocuSign
* Supplier Security and Privacy Assurance (SSPA) program, Microsoft Learn