PAM (privileged access management) is a security framework that helps organizations manage and control access to privileged accounts and systems.
IDS (intrusion detection system) is a security technology that monitors network traffic for malicious activity.
PKI (public key infrastructure) is a set of technologies that enable secure communication over public networks.
DLP (data loss prevention) is a security technology that helps organizations prevent the unauthorized disclosure of sensitive data.
Of the above options, only DLP is specifically designed to prevent the exposure of PII outside of an organization. PAM, IDS, and PKI can all be used to help protect PII, but they are not specifically designed for this purpose.