10- For a vehicle that travels at a velocity of v = 10 m/s, and uses a carrier frequency f = 2GHz (2=0.15m), and it is determined that the coherence bandwidth is B. = 300 KHz. Then, a) The delay spread ta is us. b) The coherence time Tc is ms. crossings per sec, and the fading c) If p =0.25, then the level crossing rate is duration is ----------- ms. d) If the symbol bandwidth is Bs = 250 KHz, then the signal is experiencing (A- Frequency-selective & Fast Fading, B- Frequency-selective & Slow Fading, C-Flat & Fast Fading, D-Flat & Slow Fading)