What are the two classifications of an active Missile Approach Warning System (MAWS)?

The correct classification of an active Missile Approach Warning System (MAWS) involves understanding its operational modalities. An active MAWS actively emits signals and analyzes reflections from missiles to detect their approach. The classifications are often framed in terms of the technology used, like LASER and Pulse Doppler RADAR, which are methods by which MAWS can detect incoming threats.

LASER systems can work by emitting coherent light to engage with the incoming missile's sensor or guidance system, while Pulse Doppler RADAR utilizes the Doppler effect to distinguish between moving targets, such as missiles, and stationary background clutter. This distinction is critical in identifying the type of threat and its trajectory, allowing for timely countermeasures.

The other options present classifications based on different criteria or categories that do not directly relate to how a MAWS operates, making them less accurate in this context. Understanding these classifications is essential for recognizing the capabilities and limitations of active systems used in electronic warfare.