What is the key function of radar systems in terms of object detection?

Correct option is B

Radar (Radio Detection and Ranging) works by:

• Transmitting electromagnetic (radio) waves toward a target.
• Receiving the reflected (echo) signals from objects.

Analyzing the time delay, frequency shift, and amplitude of the echoes to determine:

• Distance (range)
• Velocity (via Doppler shift)
• Direction and sometimes size of the object

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