Explanation
According to the General Data Protection Regulation (GDPR), data subjects have the right to withdraw their consent for processing their personal data at any time. However, this right does not apply when the processing is necessary for archiving purposes in the public interest, scientific or historical research purposes or statistical purposes, in accordance with Article 89(1) of the GDPR1.
References: 1: Article 7(3) and Article 89(1) of the GDPR

Explanation
A private cloud is a cloud deployment model that provides exclusive access and control to a single organization or a specific group of users within the organization. A private cloud is best for an organization whose main objectives are to logically isolate personal data from other tenants and adopt custom privacy controls for the data, as it offers the highest level of security, privacy, and customization among the cloud deployment models. A private cloud allows the organization to implement its own privacy policies, standards, and procedures for the personal data, as well as to configure the cloud infrastructure, services, and applications according to its specific needs and preferences. A private cloud also reduces the risk of data breaches, unauthorized access, or co-mingling of data from other tenants, as the personal data is stored and processed in a dedicated and isolated environment.
References: CDPSE Review Manual, 2021, p. 125

Explanation
Public key infrastructure (PKI) is a system that enables the use of public key cryptography, which is a method of encrypting and authenticating data using a pair of keys: a public key and a private key. Public key cryptography can protect against man-in-the-middle (MITM) attacks, which are attacks where an attacker intercepts and modifies the communication between two parties. PKI makes public key cryptography feasible by providing a way to generate, distribute, verify, and revoke public keys. PKI also uses digital certificates, which are documents that bind a public key to an identity, and certificate authorities, which are trusted entities that issue and validate certificates. By using PKI, the parties can ensure that they are communicating with the intended recipient and that the data has not been tampered with by an attacker.
References:
What is Public Key Infrastructure (PKI)? - Fortinet
How is man-in-the-middle attack prevented in TLS? [duplicate]
A brief look at Man-in-the-Middle Attacks and the Role of Public Key Infrastructure (PKI)

Explanation
Cryptographic erasure is a data sanitization method that uses encryption to render data unreadable and unrecoverable. It is the best method when there is a need to balance the destruction of data and the ability to recycle IT assets, because it does not damage the storage media and allows it to be reused or sold. It is also faster and more environmentally friendly than physical destruction methods.
References:
ISACA Certified Data Privacy Solutions Engineer (CDPSE) Exam Content Outline, Domain 2: Privacy Architecture, Task 2.4: Implement data sanitization methods to ensure data privacy and security, Subtask 2.4.1: Select appropriate data sanitization methods based on the type of data and storage media.
What is Data Sanitization? | Data Erasure Methods | Imperva