What are the two classifications of a passive Missile Approach Warning System (MAWS)?

A passive Missile Approach Warning System (MAWS) is designed to detect incoming missile threats by analyzing emissions from the missile systems during their flight. The correct classification of such systems focuses on the types of wavelengths they monitor, which are primarily Ultraviolet (UV) and Infrared (IR).

Ultraviolet detection mechanisms are effective at identifying missile plumes and other signatures that emit UV radiation during different phases of flight. Infrared systems, on the other hand, are used to sense the thermal signatures of an approaching missile, particularly important during the launch phase when the missile exhaust is at its hottest.

While other options present different types of systems or technologies, they do not accurately reflect the specific classifications related to passive MAWS. For example, active and passive refer to broader categories of system operation rather than specific detection methods used in MAWS. Similarly, LASER, Pulse Doppler RADAR, RADAR, and LIDAR pertain to technologies that either transmit their own emissions or classify systems based on the type of detection technique rather than the passive detection categories relevant to passive MAWS.