Comprehensive and Detailed Explanation:
The greatest concern is if the vendor is excluded from the organization's third-party due diligence process.
Without proper due diligence, the organization has no assurance that the vendor meets minimum security and privacy requirements, exposing PII to significant risk.
* Option A: External-facing services carry risk but can be mitigated by proper controls.
* Option B: Lack of dedicated privacy staff may increase risk, but controls may still exist.
* Option C: Fourth-party hosting adds risk but is acceptable if included in due diligence.
* Option D: Correct - exclusion from due diligence represents a fundamental breakdown in vendor risk management.
# ISACA Reference: CISA Review Manual 27th Edition, Domain 5, section on third-party/vendor risk management and data privacy.

Explanation/Reference:
Explanation:
Programmers should perform unit, module, and full regression testing following any changes to an application or system.

Penetration testing is a method of evaluating the security of a system or network by simulating an attack from a malicious source. Penetration testing typically consists of four phases: planning, discovery, attacks, and reporting. In the discovery phase, penetration testers gather information about the target system or network, such as host detection, domain name system (DNS) interrogation, port scanning, service identification, operating system fingerprinting, vulnerability scanning, etc. This information can help to identify potential entry points, weaknesses, or vulnerabilities that can be exploited in the subsequent attack phase. Host detection and DNS interrogation are techniques that can be used in the discovery phase to determine the active hosts and their IP addresses and hostnames on the target network. References: [ISACA CISA Review Manual 27th Edition], page 368.

Section: Governance and Management of IT