To ingest external logs from various vendors, a Cortex XDR Pro per TB license is required. This licensing model is tailored for handling large volumes of data, making it suitable for processing logs from multiple external sources.

The Cortex XDR module that can prevent an attacker from loading dynamic libraries on macOS from an insecure location is 'Dylib Hijacking.' This specific module is designed to counteract dylib-hijacking attacks, where an attacker tries to exploit dynamic library loading mechanisms by injecting malicious libraries from insecure locations to gain control over a process. The name directly indicates its purpose related to dynamic libraries, making it the correct choice.

The purpose of the Unit 42 team is to focus on threat research, malware analysis, and threat hunting. Unit 42 is known for its efforts in understanding and mitigating cybersecurity threats, providing valuable insights through their research and reports.

In Cortex XDR, an Indicator of Compromise (IOC) can be defined using various static artifacts that are considered malicious or suspicious. One such type of IOC is the full path, which helps in identifying potentially harmful files based on their location in the file system. This option aligns with the listed criteria for defining IOCs in the context of cybersecurity.

When a new incident is reported to Cortex, the 'assigned to' field value is 'Unassigned'. This is because the incident has not yet been assigned to any user for investigation. Incidents that have not been assigned are typically marked as 'Unassigned' until an analyst is specifically assigned to handle the case.