A 6m length of 150Ω transmission line is driven by a matched sinusoidal source v_G(t)=5cos(8π×10^7t-30°). If the phase velocity of the transmission line is 2 (c)/3. What is the length of the transmission line? A) 6m B) 150Ω C) 2 (c)/3 D) 5cos(8π×10^7t-30°)