The interaction of the electromagnetic radiation produced with a specific wave length to illuminate a target on the terrain for studying its scattered radiance, is called:

Correct option is C

Active remote sensing involves the use of electromagnetic radiation generated by the sensing system itself to illuminate a target. The sensor then detects the radiation scattered or reflected back from the target to analyze its properties. Examples of active remote sensing include RADAR and LiDAR systems.
1.Natural Remote Sensing: This is not a standard term in remote sensing literature.
2.Remote Sensing: This is a general term for observing or analyzing objects or areas from a distance without direct contact. It encompasses both active and passive remote sensing techniques.
3.Active Remote Sensing: In this method, the system emits its radiation to interact with the target, allowing measurements in various environmental conditions, such as at night or under cloud cover.
4.Passive Remote Sensing: This relies on natural sources of radiation, like sunlight, for illumination. The sensor detects reflected or emitted radiation from the target but does not produce its source of radiation.