आवृत्ति बदलाव (frequency shifts) को मापकर चलती वस्तुओं का पता लगाने के लिए मुख्य रूप से किस रडार प्रणाली का उपयोग किया जाता है?

Consider the following statements regarding amplitude modulation and choose the correct option: Statement A: Amplitude modulated waves can be produced by application of the message signal and the carrier wave to a non-linear device, followed by a band pass filter. Statement B: For a sinusoidal message signal, an amplitude modulated wave contains frequencies ωm, 2ωm and ωc, each of the same amplitude.

In the context of optical wireless communication, which characteristic of Li-Fi technology distinguishes it from traditional Wi-Fi?