Final answer:
A data loss prevention system (DLP) is the best choice for an egress monitoring system that will prevent data exfiltration.
Step-by-step explanation:
The best choice for an egress monitoring system that will prevent data exfiltration is a data loss prevention system (DLP). A DLP system is designed to identify and protect sensitive data from being leaked or transferred outside of the network. It can monitor and control the movement of data across various channels, such as email, web, USB drives, and cloud storage, to prevent unauthorized access or exfiltration of data.
While a network intrusion detection system (NIDS), network intrusion prevention system (NIPS), and a firewall can help in detecting and blocking attacks, they are not specifically designed to prevent data exfiltration. Their primary focus is on monitoring and protecting the network from various types of threats and intrusions.