Explanation
The availability of application data flow diagrams is the most significant factor that impacts an organization's ability to respond to data subject access requests. Data subject access requests are requests made by data subjects to exercise their rights under privacy laws or regulations, such as the right to access, rectify, erase, or port their personal data. To respond to these requests effectively and efficiently, the organization needs to have a clear and accurate understanding of how personal data is collected, processed, stored, shared, and disposed of within its applications and systems. Application data flow diagrams are graphical representations of the data lifecycle that show the sources, destinations, transformations, and dependencies of the data. Having these diagrams readily available helps the organization to locate, retrieve, modify, or delete the personal data in response to the data subject access requests. The other options are less significant or relevant than the availability of application data flow diagrams, as they do not directly affect the organization's ability to identify and access the personal data.
References: CDPSE Review Manual, 2021, p. 83

Explanation
The primary means by which an organization communicates customer rights as it relates to the use of their personal information is publishing a privacy notice. A privacy notice is a document that informs the customers about how the organization collects, uses, shares, and protects their personal information, and what rights and choices they have regarding their data4. A privacy notice is a legal requirement under many data protection laws and regulations, such as the General Data Protection Regulation (GDPR), the California Consumer Privacy Act (CCPA), or the Personal Information Protection and Electronic Documents Act (PIPEDA)5 . A privacy notice is also a good practice to demonstrate the organization's commitment to transparency, accountability, and customer trust. References:
ISACA Glossary of Terms
Article 13 and 14 of the GDPR
[Section 1798.100 of the CCPA]
[Schedule 1, Principle 4.8 of the PIPEDA]
[ISACA CDPSE Review Manual, Chapter 1, Section 1.3.2]

Explanation
The first consideration when conducting a privacy impact assessment (PIA) is the applicable privacy legislation that governs the collection, processing, storage, transfer, and disposal of personal data within the scope of the assessment. The applicable privacy legislation may vary depending on the jurisdiction, sector, or purpose of the data processing activity. The PIA should identify and comply with the relevant legal requirements and obligations for data protection and privacy, such as obtaining consent, providing notice, ensuring data quality and security, respecting data subject rights, and reporting data breaches. The applicable privacy legislation also determines the criteria, methodology, and documentation for conducting the PIA.
References:
ISACA, Performing an Information Security and Privacy Risk Assessment1
ISACA, Best Practices for Privacy Audits2
ISACA, GDPR Data Protection Impact Assessments3
ISACA, GDPR Data Protection Impact Assessment Template4

Explanation
Any organization collecting information about EU residents is required to operate with transparency in collecting and using their personal information. Chapter III of the GDPR defines eight data subject rights that have become foundational for other privacy regulations around the world:
Right to access personal data. Data subjects can access the data collected on them.
One of the privacy requirements related to the rights of data subjects is the right to access, which means that individuals have the right to obtain a copy of their personal data, as well as information about how their data is processed, by whom, for what purposes, and for how long. To meet this requirement, an organization's technology stack should incorporate features that allow individuals to have direct access to their data, such as self-service portals, dashboards, or applications. This way, individuals can exercise their right to access without relying on intermediaries or manual processes, which can be inefficient, error-prone, or insecure. References: : CDPSE Review Manual (Digital Version), page 137