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.

The Controller Area Network - CAN bus is a message-based protocol designed to allow the Electronic Control Units (ECUs) found in today's automobiles, as well as other devices, to communicate with each other in a reliable, priority-driven fashion. Messages or "frames" are received by all devices in the network, which does not require a host computer.

The best way to see the entire contents of the downloaded files in Wireshark is to change the display filter to ftp-data and follow the TCP streams. FTP-data is a protocol that is used to transfer files between an FTP client and server using TCP port 20. By filtering for ftp-data packets and following the TCP streams, the analyst can see the actual file data that was transferred during the FTP session.

A web application firewall (WAF) is a tool that can protect web servers from attacks such as SQL injection, cross-site scripting, and other web-based threats. A WAF can filter, monitor, and block malicious HTTP traffic before it reaches the web server. A WAF can also be configured with rules and policies to detect and prevent specific types of attacks.