Explanation:

Only two

• Radar technology is mainly known for generating weather data and for the surveillance of aircraft. Less well known are its applications in the study of migratory birds, bats, and insects, which initially showed up as "phantom signals" on the radar screens during World War II.
• Radar-based rainfall information has been widely used in hydrological and meteorological applications, as it provides data with a high spatial and temporal resolution that improve rainfall representation.
• First is incorrect -
• Only doubt in the correct answer is meaning od RADAR , if multiple meanings are allowed that all three can be correct. So depends upon key. We are going with two only