An Intrusion Detection System (IDS) is adept at continuously monitoring network traffic for abnormal behavior and is specifically designed to alert the security team about potential threats without modifying, discarding, or preventing the flow of traffic, which aligns with the requirement in the given scenario. On the other hand, an Intrusion Prevention System (IPS) not only detects but also takes action to prevent the identified threats, which could interfere with data flow. A Jump Server is a hardened and monitored device that acts as a bridging point for administrators to connect to other servers but does not perform real-time threat monitoring. A Unified Threat Management (UTM) device combines several security functions into one, yet its threat detection capabilities are broader and not solely focused on network traffic monitoring.